Decrypting PIFF MP4s does not work

[truedread]

PIFF encrypted MP4s use UUIDs for box names instead of the normal type names (tenc, senc, pssh), so the decrypter would need to be updated to map each UUID to the box. Fortunately, pymp4 already supports parsing the PIFF boxes (at least on my fork).

[truedread]

This project was mostly made as a learning experiment for me, not really intended for any actual use. If you want something reliable, I would recommend maintained libraries like Bento4 or shaka-packager.