I tried to use mp4box to perform the decryption. I believe this is PIFF and CENC compatible file. It always seg faults when attempting to decrypt though.
http://gpac.wp.mines-telecom.fr/mp4b...on-encryption/
I wrote something to parse the file and decrypt the encrypted NALs. I couldn't get it to work properly though. I would just get a green screen with some corruption at the top on playback.
I discovered
http://www.bok.net/trac/bento4/ after doing that. I attempted to use their mp4decrypt to decrypt. That file also didn't seem to work either.
I am not sure if the decryption is incorrect or the key is just wrong.