File headers: use SPDX license identifiers

See T95597

58 files changed, 58 insertions, 986 deletions

diff --git a/rigify/__init__.py b/rigify/__init__.py
index 5d8782d4..fea14876 100644
--- a/rigify/__init__.py
+++ b/rigify/__init__.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/base_generate.py b/rigify/base_generate.py
index 7bdb8b0e..81de462a 100644
--- a/rigify/base_generate.py
+++ b/rigify/base_generate.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/base_rig.py b/rigify/base_rig.py
index 87c89c17..b1c911cb 100644
--- a/rigify/base_rig.py
+++ b/rigify/base_rig.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/feature_set_list.py b/rigify/feature_set_list.py
index cb46f5c6..819b2c0e 100644
--- a/rigify/feature_set_list.py
+++ b/rigify/feature_set_list.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 from typing import List
 
diff --git a/rigify/feature_sets/__init__.py b/rigify/feature_sets/__init__.py
index e9981d52..91f1cdf7 100644
--- a/rigify/feature_sets/__init__.py
+++ b/rigify/feature_sets/__init__.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # Redirect the module loader to the user scripts directory.
 
diff --git a/rigify/generate.py b/rigify/generate.py
index a674ade4..b3707a7e 100644
--- a/rigify/generate.py
+++ b/rigify/generate.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/metarig_menu.py b/rigify/metarig_menu.py
index 7a48df44..f6dda026 100644
--- a/rigify/metarig_menu.py
+++ b/rigify/metarig_menu.py
@@ -1,20 +1,4 @@
-# ##### BEGIN GPL LICENSE BLOCK #####
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ##### END GPL LICENSE BLOCK #####
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/operators/__init__.py b/rigify/operators/__init__.py
index 6c96f908..bda38619 100644
--- a/rigify/operators/__init__.py
+++ b/rigify/operators/__init__.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/operators/copy_mirror_parameters.py b/rigify/operators/copy_mirror_parameters.py
index a844f8da..982887b2 100644
--- a/rigify/operators/copy_mirror_parameters.py
+++ b/rigify/operators/copy_mirror_parameters.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/operators/upgrade_face.py b/rigify/operators/upgrade_face.py
index 08239353..17953802 100644
--- a/rigify/operators/upgrade_face.py
+++ b/rigify/operators/upgrade_face.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rig_lists.py b/rigify/rig_lists.py
index ae7d9d00..1526d488 100644
--- a/rigify/rig_lists.py
+++ b/rigify/rig_lists.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 import os
 import traceback
diff --git a/rigify/rig_ui_template.py b/rigify/rig_ui_template.py
index 528a732c..f3bc5374 100644
--- a/rigify/rig_ui_template.py
+++ b/rigify/rig_ui_template.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/basic/copy_chain.py b/rigify/rigs/basic/copy_chain.py
index 54f09ad7..cd2de206 100644
--- a/rigify/rigs/basic/copy_chain.py
+++ b/rigify/rigs/basic/copy_chain.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/basic/pivot.py b/rigify/rigs/basic/pivot.py
index 0301790f..e10bf4e2 100644
--- a/rigify/rigs/basic/pivot.py
+++ b/rigify/rigs/basic/pivot.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/basic/raw_copy.py b/rigify/rigs/basic/raw_copy.py
index e562038c..8aa593aa 100644
--- a/rigify/rigs/basic/raw_copy.py
+++ b/rigify/rigs/basic/raw_copy.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/basic/super_copy.py b/rigify/rigs/basic/super_copy.py
index e2f70842..e43993b4 100644
--- a/rigify/rigs/basic/super_copy.py
+++ b/rigify/rigs/basic/super_copy.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/chain_rigs.py b/rigify/rigs/chain_rigs.py
index 96bf8abd..9a96faa0 100644
--- a/rigify/rigs/chain_rigs.py
+++ b/rigify/rigs/chain_rigs.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/face/basic_tongue.py b/rigify/rigs/face/basic_tongue.py
index 380e14df..005fe551 100644
--- a/rigify/rigs/face/basic_tongue.py
+++ b/rigify/rigs/face/basic_tongue.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/face/skin_eye.py b/rigify/rigs/face/skin_eye.py
index da4da1e5..13628f41 100644
--- a/rigify/rigs/face/skin_eye.py
+++ b/rigify/rigs/face/skin_eye.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/face/skin_jaw.py b/rigify/rigs/face/skin_jaw.py
index 6829818c..fdcd904f 100644
--- a/rigify/rigs/face/skin_jaw.py
+++ b/rigify/rigs/face/skin_jaw.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/arm.py b/rigify/rigs/limbs/arm.py
index e276407e..07450833 100644
--- a/rigify/rigs/limbs/arm.py
+++ b/rigify/rigs/limbs/arm.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/front_paw.py b/rigify/rigs/limbs/front_paw.py
index 83cbbd81..d5c36f96 100644
--- a/rigify/rigs/limbs/front_paw.py
+++ b/rigify/rigs/limbs/front_paw.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/leg.py b/rigify/rigs/limbs/leg.py
index 59d48993..4492cb11 100644
--- a/rigify/rigs/limbs/leg.py
+++ b/rigify/rigs/limbs/leg.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/limb_rigs.py b/rigify/rigs/limbs/limb_rigs.py
index 7ecc508f..2b4723a4 100644
--- a/rigify/rigs/limbs/limb_rigs.py
+++ b/rigify/rigs/limbs/limb_rigs.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/paw.py b/rigify/rigs/limbs/paw.py
index 3aa336ac..c761f119 100644
--- a/rigify/rigs/limbs/paw.py
+++ b/rigify/rigs/limbs/paw.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/rear_paw.py b/rigify/rigs/limbs/rear_paw.py
index cdbbd91e..54cfbc4d 100644
--- a/rigify/rigs/limbs/rear_paw.py
+++ b/rigify/rigs/limbs/rear_paw.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/simple_tentacle.py b/rigify/rigs/limbs/simple_tentacle.py
index 50a5c6ca..21893c14 100644
--- a/rigify/rigs/limbs/simple_tentacle.py
+++ b/rigify/rigs/limbs/simple_tentacle.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/super_finger.py b/rigify/rigs/limbs/super_finger.py
index 664094d1..9eed5415 100644
--- a/rigify/rigs/limbs/super_finger.py
+++ b/rigify/rigs/limbs/super_finger.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/super_limb.py b/rigify/rigs/limbs/super_limb.py
index 5020f091..f5e4c7bd 100644
--- a/rigify/rigs/limbs/super_limb.py
+++ b/rigify/rigs/limbs/super_limb.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/limbs/super_palm.py b/rigify/rigs/limbs/super_palm.py
index 7573e4a7..62e39c49 100644
--- a/rigify/rigs/limbs/super_palm.py
+++ b/rigify/rigs/limbs/super_palm.py
@@ -1,20 +1,4 @@
-# ##### BEGIN GPL LICENSE BLOCK #####
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ##### END GPL LICENSE BLOCK #####
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/anchor.py b/rigify/rigs/skin/anchor.py
index 0392761f..0474a134 100644
--- a/rigify/rigs/skin/anchor.py
+++ b/rigify/rigs/skin/anchor.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/basic_chain.py b/rigify/rigs/skin/basic_chain.py
index b2cac8a6..8dfb6140 100644
--- a/rigify/rigs/skin/basic_chain.py
+++ b/rigify/rigs/skin/basic_chain.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/glue.py b/rigify/rigs/skin/glue.py
index 6f9400cd..cb8ddf48 100644
--- a/rigify/rigs/skin/glue.py
+++ b/rigify/rigs/skin/glue.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/skin_nodes.py b/rigify/rigs/skin/skin_nodes.py
index 6dec06e8..20a7df8c 100644
--- a/rigify/rigs/skin/skin_nodes.py
+++ b/rigify/rigs/skin/skin_nodes.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/skin_parents.py b/rigify/rigs/skin/skin_parents.py
index 956c5ca3..a60b85b9 100644
--- a/rigify/rigs/skin/skin_parents.py
+++ b/rigify/rigs/skin/skin_parents.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/skin_rigs.py b/rigify/rigs/skin/skin_rigs.py
index a4bc361e..bc6b6350 100644
--- a/rigify/rigs/skin/skin_rigs.py
+++ b/rigify/rigs/skin/skin_rigs.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/stretchy_chain.py b/rigify/rigs/skin/stretchy_chain.py
index c6fae592..18313757 100644
--- a/rigify/rigs/skin/stretchy_chain.py
+++ b/rigify/rigs/skin/stretchy_chain.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/skin/transform/basic.py b/rigify/rigs/skin/transform/basic.py
index 2069615a..48a178e4 100644
--- a/rigify/rigs/skin/transform/basic.py
+++ b/rigify/rigs/skin/transform/basic.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/spines/basic_spine.py b/rigify/rigs/spines/basic_spine.py
index 5c64e634..4499af69 100644
--- a/rigify/rigs/spines/basic_spine.py
+++ b/rigify/rigs/spines/basic_spine.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/spines/basic_tail.py b/rigify/rigs/spines/basic_tail.py
index b5bf1076..a69ac800 100644
--- a/rigify/rigs/spines/basic_tail.py
+++ b/rigify/rigs/spines/basic_tail.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/spines/spine_rigs.py b/rigify/rigs/spines/spine_rigs.py
index 3c8b8223..9e25018e 100644
--- a/rigify/rigs/spines/spine_rigs.py
+++ b/rigify/rigs/spines/spine_rigs.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/spines/super_head.py b/rigify/rigs/spines/super_head.py
index f71a95ff..149dd1d8 100644
--- a/rigify/rigs/spines/super_head.py
+++ b/rigify/rigs/spines/super_head.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/rigs/spines/super_spine.py b/rigify/rigs/spines/super_spine.py
index 86021c84..9d9e6d0f 100644
--- a/rigify/rigs/spines/super_spine.py
+++ b/rigify/rigs/spines/super_spine.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/ui.py b/rigify/ui.py
index a411d68b..54ae4a70 100644
--- a/rigify/ui.py
+++ b/rigify/ui.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/animation.py b/rigify/utils/animation.py
index 8710e74d..e9a56f4c 100644
--- a/rigify/utils/animation.py
+++ b/rigify/utils/animation.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/bones.py b/rigify/utils/bones.py
index 4416a1d6..16cf62de 100644
--- a/rigify/utils/bones.py
+++ b/rigify/utils/bones.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/collections.py b/rigify/utils/collections.py
index a19b9da1..6b98b86b 100644
--- a/rigify/utils/collections.py
+++ b/rigify/utils/collections.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/errors.py b/rigify/utils/errors.py
index 0fc81ccb..1fa1f11b 100644
--- a/rigify/utils/errors.py
+++ b/rigify/utils/errors.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/layers.py b/rigify/utils/layers.py
index 27c67f0b..1b807cc7 100644
--- a/rigify/utils/layers.py
+++ b/rigify/utils/layers.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/mechanism.py b/rigify/utils/mechanism.py
index 930309b3..d8ac3a62 100644
--- a/rigify/utils/mechanism.py
+++ b/rigify/utils/mechanism.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/metaclass.py b/rigify/utils/metaclass.py
index c9d4ec1a..1c53a8ef 100644
--- a/rigify/utils/metaclass.py
+++ b/rigify/utils/metaclass.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/misc.py b/rigify/utils/misc.py
index 9d4307c0..99767e09 100644
--- a/rigify/utils/misc.py
+++ b/rigify/utils/misc.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/naming.py b/rigify/utils/naming.py
index a713e407..06d9e36e 100644
--- a/rigify/utils/naming.py
+++ b/rigify/utils/naming.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/node_merger.py b/rigify/utils/node_merger.py
index 49ebaf27..d627707f 100644
--- a/rigify/utils/node_merger.py
+++ b/rigify/utils/node_merger.py
@@ -1,20 +1,4 @@
-# ====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-# ======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/rig.py b/rigify/utils/rig.py
index 7969a34f..654f3580 100644
--- a/rigify/utils/rig.py
+++ b/rigify/utils/rig.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/widgets.py b/rigify/utils/widgets.py
index b3715f80..16f5faab 100644
--- a/rigify/utils/widgets.py
+++ b/rigify/utils/widgets.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/widgets_basic.py b/rigify/utils/widgets_basic.py
index 543457eb..854b4d7e 100644
--- a/rigify/utils/widgets_basic.py
+++ b/rigify/utils/widgets_basic.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>
 
diff --git a/rigify/utils/widgets_special.py b/rigify/utils/widgets_special.py
index 8e2d7a27..276590a5 100644
--- a/rigify/utils/widgets_special.py
+++ b/rigify/utils/widgets_special.py
@@ -1,20 +1,4 @@
-#====================== BEGIN GPL LICENSE BLOCK ======================
-#
-#  This program is free software; you can redistribute it and/or
-#  modify it under the terms of the GNU General Public License
-#  as published by the Free Software Foundation; either version 2
-#  of the License, or (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program; if not, write to the Free Software Foundation,
-#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-#
-#======================= END GPL LICENSE BLOCK ========================
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 # <pep8 compliant>