Patent ID: 7840818

Claim:
A device for playback of encrypted audio and/or video tracks from a memory card, wherein an audio and/or video track comprises one or more than one audio and/or video file, the audio and/or video file being retrievable in a plurality of portions, the device comprising: a processor; and a module operatively coupled with the processor and configured, for each audio and/or video file within an audio and/or video track, for: obtaining an encrypted key from a protected area of the memory card; retrieving one of the plurality of portions of the audio and/or video file from the memory card; decrypting the obtained encrypted key; decrypting the one of the plurality of portions of the audio and/or video file with the decrypted key; and deleting the decrypted key after decrypting the one of the plurality of portions of the audio and/or video file before decrypting an additional one of the plurality of portions of the audio and/or video file.