METHOD AND DEVICE TO PROTECT A DECRYPTED MEDIA CONTENT BEFORE TRANSMISSION TO A CONSUMPTION DEVICE

摘要

A method to protect a media content encrypted by a media content key, said method being carried out by a security module embedded into a reception device and connected to a consumption device, comprising: receiving an encrypted media content, encrypted by a media content key; receiving a message, being encrypted by a personal key of the security module, containing the media content key; decrypting the message by the personal key to retrieve the media content key; decrypting the encrypted media content by the media content key; generating a current local key; encrypting a portion of the media content by the current local key, said portion defining a chunk; transmitting the current local key to the consumption device; transmitting the encrypted chunk to the consumption device; repeating the previous four steps for different chunks of the media content and modifying the current local key for the different chunks.

主权项

1. A method to protect a media content, said method comprising:
a. receiving at a reception device an encrypted media content, said media content being encrypted by a media content key, said reception device being connectable to a security module; b. receiving a message containing the media content key, said message being encrypted by a personal key of the security module; c. decrypting the message using the personal key to retrieve the media content key; d. decrypting the encrypted media content using the media content key; e. generating a current local key; f. encrypting a portion of the media content by the current local key, said portion defining a chunk; g. transmitting the current local key to the consumption device; h. transmitting the encrypted chunk to the consumption device; and i. repeating the steps e) to h) for additional chunks of the media content and modifying the current local key for the different chunks.