Media Player Classic HomeCinema license is available in this file :
\App\MediaPlayerClassicHC\x86\COPYING.txt

Source code is available at this address (LiberKey.com) :
http://download.liberkey.com/sources/MPCHomeCinema

Source code is available at this address (original address)
http://mpc-hc.svn.sourceforge.net/viewvc/mpc-hc/