It's not just base-64. The 'url' of the next chunk of data is encoded in the data of the previous chunk. (As opposed to just doing a chunked transfer of a bigge

It's not just base-64. The 'url' of the next chunk of data is encoded in the data of the previous chunk. (As opposed to just doing a chunked transfer of a bigger file). This feature is only in place for some videos, mostly music videos. This was deemed a 'rolling cipher'. It obviously isn't. Or at best, its a rolling cipher with the key being completely public at all times.