A technique for recording information received by a satellite digital audio radio (SDAR) receiver for playback encrypts content of a received SDAR channel using a local key that is unique to the SDAR receiver. The encrypted content is then stored for playback. When selected for playback, the stored encrypted content is decrypted with the local key and provided to the user.

 
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> Method for transmitting data from a transmitting station to a receiving station via a radio link, and corresponding receiving station and transmitting station

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