Add a proper license markdown file

This file indicates that Unity's legal team as reviewed the licensing
for this repository.

1 files changed, 39 insertions, 0 deletions

diff --git a/license.md b/license.md
new file mode 100644
index 0000000..f85cae9
--- /dev/null
+++ b/license.md
@@ -0,0 +1,39 @@
+Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.  Copyright
+(c) 1996-1999 by Silicon Graphics. All rights reserved.  Copyright (c)
+1999-2011 Hewlett-Packard Development Company, L.P.  Copyright (c) 2008-2021
+Ivan Maidanski
+
+MIT license
+
+Permission is hereby granted, free of charge, to any person obtaining a copyof
+this software and associated documentation files (the "Software"), to dealin
+the Software without restriction, including without limitation the rightsto
+use, copy, modify, merge, publish, distribute, sublicense, and/or sellcopies of
+the Software, and to permit persons to whom the Software isfurnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+allcopies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ORIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY,FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
+EVENT SHALL THEAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHERLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THESOFTWARE.
+
+--------------------------------
+
+A few files in the sysdeps directory were inherited in part from the
+Boehm-Demers-Weiser conservative garbage collector, and are covered by its
+license, which is similar in spirit:
+
+THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED OR
+IMPLIED.  ANY USE IS AT YOUR OWN RISK.
+
+Permission is hereby granted to use or copy this program for any purpose,
+provided the above notices are retained on all copies.  Permission to modify
+the code and to distribute modified code is granted, provided the above notices
+are retained, and a notice that the code was modified is included with the
+above copyright notice.