Verfahren und Vorrichtung zum Schutz von Entschlüsselten Medieninhalten vor der Übertragung an eine Verbrauchervorrichtung

Details

Veröffentlichungs-Nr.

EP3070629

Aktenzeichen

EP15159981

Anmeldetag

20. März 2015

Veröffentlichung

15. Mai 2019

Erteilung

15. Mai 2019

Rechtsraum

EP

IPC

G06F21/10H04N21/436H04N21/4408H04N21/845H04N21/418H04N21/4367H04N21/4405H04N21/4623H04N21/658

Abstract

The present application refers to the protection of conditional-access media content received and processed by a decoder. The decoder is in charge of receiving the protected media content and removing the protection in order to give access to a user to the media content. More specifically, the invention concerns a method to protect a media content (MC) encrypted by a media content key (MK), said method being carried out by a security module (SM) embedded into a reception device and in connection with a decoder, said method comprising the steps of : a. receiving an encrypted media content (MC)MK, said media content being encrypted by a media content key (MK), b. receiving a secure message containing the media content key (MK), said message being encrypted by a personal key (PK) of the security module (SM), c. decrypting the secure message by the personal key (PK) to retrieve the media content key (MK), d. decrypting the encrypted media content by the media content key, e. generating a current local key (K1, K2, K3... Kn), f. encrypting a portion of the media content (MC) by the current local key, said portion defining a chunk, g. securely transmitting the current local key to the decoder, h. transmitting the encrypted chunk ((CHn)Kn) to the decoder, i. repeating the steps e) to h) for each chunk of the media content and modifying the current local key for each different chunk. The invention further concerns a security module (SM) in which the method of the invention is carried out.

Anmelder

Firma

Nagravision S.A.

Land

🇨🇭 Schweiz

Fachgebiete