Patent ID: 7861312

Claim:
A secure portable media player comprising: an input/output interface circuit for connecting to a host network connected to a license server and for receiving an encrypted media file downloaded from the license server to the secure portable media player; wherein the input/output interface circuit also receives a transfer key from the license server, the transfer key including a content key and copy rules for the encrypted media file; a flash memory for storing the encrypted media file downloaded from the license server; a decryptor that receives the encrypted media file and uses the content key to generate a media stream of playable media; a media decoder for playing the media stream from the decryptor and generating an audio signal for generating audio heard by a user or generating a video display signal for generating a display visible to the user of the secure portable media player; and a processor for executing routines of instructions for activating the decryptor with the content key to unlock the media stream when copy rules for the encrypted media file have not been exceeded; a unique media player identifier, stored on the secure portable media player, that has a different value for each secure portable media player; wherein the input/output interface circuit transfers the unique media player identifier to the license server before receiving the encrypted media file downloaded from the license server to the secure portable media player, wherein the license server generates the content key as a function of polar coordinates of the unique media player identifier, a player manufacturer, and a song genre wherein the decryptor is disabled and prevented from generating the media stream when the copy rules have been exceeded, whereby copy rules are enforced by the secure portable media player.