With the release of AMP for OS4 the binaries comes with compiler symbols, which reveals few interesting things. Amidog movie player is staticaly linked with libdvdread (GPL) libdecss (GPL) libdvdnav (GPL) and libquicktime (LGPL). Also, mpeg video decoder uses libmpeg2 (GPL) and ac3 decoder uses liba52 (GPL). Apparently, AMP author was warned about that on his discussion board, but seems like he silently ignored the fact of breaking GPL licence(s).
[Christophe - Amidog has released the AMP sources]