Legality
Although XBMP is licensed under the GNU General Public License (GPL), it is written for use with Microsoft's XDK and so is not legally available as an executable program to non-official Microsoft game-publishers. Users are encouraged to compile their own binaries from the public CVS repository using the XDK, rather than downloading a questionable illegally released executable. XBMP's full source code is however legal 'as is' and is available on SourceForge.
Read more about this topic: Xbox Media Player