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README.md

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+# Game maps as OBJ meshes
+
+## License
+
+See `.txt` files associated with each map for the license.
+
+All maps in the `redeclipse/` and `tesseract/` folders are under free culture
+Creative Commons licenses (with commercial use and modification allowed).
+In those folders, CC BY-SA is the strictest license used, although some maps
+are under CC BY or CC0 instead.
+
+**Warning:** Some maps in the `sauerbraten/` folder use Creative Commons licenses
+that disallow commercial use. Still, modification is allowed as maps that use a
+no-derivatives license were excluded from this set.

redeclipse/README.txt

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+Content included in the game (maps, textures, sounds, models etc.) may have
+individual copyrights and distribution restrictions (see individual readmes),
+note that all content in Red Eclipse is intended to be "open source" friendly.
+
+In the absence of an explicit license, content is considered to be covered by
+the CC-BY-SA license, either version 4.0 or (at your option) any later version,
+you may use the content in Red Eclipse so long as you obey individual
+licensing criteria.
+
+    Red Eclipse, Copyright (C) 2009-2019 Red Eclipse Team
+    Creative Commons Attribution ShareAlike 4.0+ License (CC-BY-SA)
+    See cc-by-sa.txt or http://creativecommons.org/licenses/by-sa/4.0/
+
+For a license breakdown of all content in Red Eclipse, see all-licenses.txt.
+
+The use of trademarks unique to the Red Eclipse project are in addition
+governed by the Red Eclipse Mark Policy (see trademark.txt).