File headers: SPDX License migration

Use a shorter/simpler license convention, stops the header taking so
much space.

Follow the SPDX license specification: https://spdx.org/licenses

- C/C++/objc/objc++
- Python
- Shell Scripts
- CMake, GNUmakefile

While most of the source tree has been included

- `./extern/` was left out.
- `./intern/cycles` & `./intern/atomic` are also excluded because they
  use different header conventions.

doc/license/SPDX-license-identifiers.txt has been added to list SPDX all
used identifiers.

See P2788 for the script that automated these edits.

Reviewed By: brecht, mont29, sergey

Ref D14069

5 files changed, 8 insertions, 101 deletions

diff --git a/intern/sky/CMakeLists.txt b/intern/sky/CMakeLists.txt
index f67941605aa..45fb64fa16d 100644
--- a/intern/sky/CMakeLists.txt
+++ b/intern/sky/CMakeLists.txt
@@ -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
 
 set(INC
   include
diff --git a/intern/sky/source/sky_float3.h b/intern/sky/source/sky_float3.h
index 8370d8127ed..6394871ea0b 100644
--- a/intern/sky/source/sky_float3.h
+++ b/intern/sky/source/sky_float3.h
@@ -1,18 +1,4 @@
-/*
- * 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.
- */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 /** \file
  * \ingroup intern_sky_modal
diff --git a/intern/sky/source/sky_model.cpp b/intern/sky/source/sky_model.cpp
index 946c230781f..f70a2a7588c 100644
--- a/intern/sky/source/sky_model.cpp
+++ b/intern/sky/source/sky_model.cpp
@@ -1,30 +1,5 @@
-/*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in the
- *       documentation and/or other materials provided with the distribution.
- *     * None of the names of the contributors may be used to endorse or promote
- *       products derived from this software without specific prior written
- *       permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * Copyright (c) 2012-2013, Lukas Hosek and Alexander Wilkie
- * All rights reserved.
- */
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2012-2013 Lukas Hosek and Alexander Wilkie. All rights reserved. */
 
 /* ============================================================================
 
diff --git a/intern/sky/source/sky_model_data.h b/intern/sky/source/sky_model_data.h
index 4626a819d90..f8398e0839c 100644
--- a/intern/sky/source/sky_model_data.h
+++ b/intern/sky/source/sky_model_data.h
@@ -1,30 +1,5 @@
-/*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above copyright
- *       notice, this list of conditions and the following disclaimer in the
- *       documentation and/or other materials provided with the distribution.
- *     * None of the names of the contributors may be used to endorse or promote
- *       products derived from this software without specific prior written
- *       permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * Copyright (c) 2012-2013, Lukas Hosek and Alexander Wilkie
- * All rights reserved.
- */
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2012-2013 Lukas Hosek and Alexander Wilkie. All rights reserved. */
 
 /* ============================================================================
 
diff --git a/intern/sky/source/sky_nishita.cpp b/intern/sky/source/sky_nishita.cpp
index 236c965fb27..f1eab181189 100644
--- a/intern/sky/source/sky_nishita.cpp
+++ b/intern/sky/source/sky_nishita.cpp
@@ -1,18 +1,5 @@
-/*
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * Copyright 2011-2020 Blender Foundation
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2020 Blender Foundation. */
 
 /** \file
  * \ingroup intern_sky_modal