These libraries are distributed under the terms of the GNU LGPL license:
http://www.gnu.org/copyleft/lesser.html



The Simple DirectMedia Layer (SDL for short) is a cross-platfrom library
designed to make it easy to write multi-media software, such as games and
emulators.

The Simple DirectMedia Layer library source code is available from:
http://www.libsdl.org/


SDL_image is a simple library to load images of various formats as SDL surfaces.
This library supports ICO(Icon)/CUR(Cursor)/BMP, PNM (PPM/PGM/PBM), XPM,
LBM(IFF ILBM), PCX, GIF, JPEG, PNG, TGA, TIFF, and XV thumbnail formats.

SDL_image source code is avaliable from:
http://www.libsdl.org/projects/SDL_image/


OpenAL Soft is an LGPL-licensed, cross-platform, software implementation 
of the OpenAL 3D audio API. It's forked from the open-sourced Windows 
version available originally from the SVN repository at openal.org.

The OpenAL Soft source code is available from:
http://kcat.strangesoft.net/openal.html

