--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/unicode/unicode-license.txt	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,50 @@
+UNICODE, INC. LICENSE AGREEMENT - DATA FILES AND SOFTWARE
+
+    Unicode Data Files include all data files under the directories
+http://www.unicode.org/Public/, http://www.unicode.org/reports/, and
+http://www.unicode.org/cldr/data/. Unicode Data Files do not include PDF
+online code charts under the directory http://www.unicode.org/Public/.
+Software includes any source code published in the Unicode Standard or under
+the directories http://www.unicode.org/Public/,
+http://www.unicode.org/reports/, and http://www.unicode.org/cldr/data/.
+
+    NOTICE TO USER: Carefully read the following legal agreement. BY
+DOWNLOADING, INSTALLING, COPYING OR OTHERWISE USING UNICODE INC.'S DATA FILES
+("DATA FILES"), AND/OR SOFTWARE ("SOFTWARE"), YOU UNEQUIVOCALLY ACCEPT, AND
+AGREE TO BE BOUND BY, ALL OF THE TERMS AND CONDITIONS OF THIS AGREEMENT. IF
+YOU DO NOT AGREE, DO NOT DOWNLOAD, INSTALL, COPY, DISTRIBUTE OR USE THE DATA
+FILES OR SOFTWARE.
+
+    COPYRIGHT AND PERMISSION NOTICE
+
+    Copyright © 1991-2013 Unicode, Inc. All rights reserved. Distributed under
+the Terms of Use in http://www.unicode.org/copyright.html.
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+copy of the Unicode data files and any associated documentation (the "Data
+Files") or Unicode software and any associated documentation (the "Software")
+to deal in the Data Files or Software without restriction, including without
+limitation the rights to use, copy, modify, merge, publish, distribute, and/or
+sell copies of the Data Files or Software, and to permit persons to whom the
+Data Files or Software are furnished to do so, provided that (a) the above
+copyright notice(s) and this permission notice appear with all copies of the
+Data Files or Software, (b) both the above copyright notice(s) and this
+permission notice appear in associated documentation, and (c) there is clear
+notice in each modified Data File or in the Software as well as in the
+documentation associated with the Data File(s) or Software that the data or
+software has been modified.
+
+    THE DATA FILES AND SOFTWARE ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD
+PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN
+THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL
+DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THE
+DATA FILES OR SOFTWARE.
+
+    Except as contained in this notice, the name of a copyright holder shall
+not be used in advertising or otherwise to promote the sale, use or other
+dealings in these Data Files or Software without prior written authorization
+of the copyright holder.