I can see the fairplay license responses but I am not sure how to parse or process them to get the correct key. There are other ways to get the content keys though.
I wrote a tool to parse the mp4(dash/piff/cenc) files originally to decrypt the files. I added the option to check a content key with the header checksum and key id. I also added an option to recreate the original m3u8 with just the video file. It parses the sidx atom box to get the correct offsets and the pssh box for the sdk:// value.
my decryption is broken though. I am still trying to figure out the problem exactly. I think i am doing something wrong with the iv.
mp4decrypt works to decrypt the files though if you can get the right key. You need to specify the track id and key to decrypt. I still want to get my script working correctly.
anyone who might know how to properly process these fairplay responses. drop me a pm. I am having trouble figuring it out.