Mini DRM solution of Normandie

Demand-side:music team
requirement analysis(core requirement):
1.file protect: only normandie can play
1.1.encrypt file music download
1.2.encrypt file cached when play
1.3.play encrypt file,playing at the same time decrypting
1.4.play, pause,resume and seek as normal, espacially seek
2.copyright protect: only can be play by normandie on a specific device and a specific period of time
2.1.imei number management
2.2.expire time management
2.3.id3 save (extra requirement)
2.4.encrypt the imei, expire time, and id3 etc