From http://www.jwz.org/xscreensaver/xscreensaver-5.31.tar.gz

[xscreensaver] / android / project / GLWallpaperService / readme.txt

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+Truly Excellent Live Wallpaper - Version 0.1
+
+
+Upstream codebases
+------------------
+
+This is a port of Xscreensaver 5.29 to Android.
+
+On the Android side, it uses Ben Gruver's version of Mark Guerra's GL 
+WallpaperService for Android.
+
+Xscreensaver's GLX hacks are OpenGL, and Android is OpenGL ES, 
+so we use the OpenGL to OpenGL ES translation shim that is in Xscreensaver.
+
+
+Compiling
+---------
+
+We are compiling our APK with ant.  If you have a problem getting this 
+to work with Eclipse, Android Studio, or some other IDE, let us know.  
+TrulyCreative is the Service, and GLWallpaperService is the library 
+which TrulyCreative uses.  Also don't forget this uses C/C++ code via 
+the NDK, so you have to build both the C/C++ and Java/Dalvik code.
+
+
+
+Licenses
+--------
+
+Some code in gl1.c is based off code from
+Jetro Lauha's San Angeles Observation project
+which is under a BSD-style license.
+
+GLWallpaperService is under an Apache License, Version 2.0.
+
+Look in the TrulyExcellent/jni/xscreensaver to see what licenses are used.
+MIT/X11 seems to be the primary license.
+
+The rest of the code is released under Apache License, Version 2.0.  
+Some of that code is from the Android Open Source Project, some is from 
+Dennis Sheil.  Dennis Sheil dual-licenses his code as MIT/X11 license also.