Once the content key and the initialization vector have been unwrapped and the play context created, then
the application can process the decryption of the content on the per frame basis for video or audio samples.
When the frame or the audio sample is decrypted, the decryption process directly passes the frame or the
sample to the relevant decoder.
Context Persistence
FPS does not keep the play context or SPC persistent. In other words, once the device resets or reboots, all
prior pieces of information are lost, and the application needs to start a new set of key requests to resume
playback.