Patent ID: 11943491
Assignee: NAGRAVISION SàRL
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 16:
17. A method of decrypting encrypted media content, the method comprising:
(a) receiving an encrypted media content stream on a server;
(b) receiving an encrypted content key for decrypting the encrypted media content;
(c) storing the encrypted content key in a key table;
(d) authenticating and then decrypting the encrypted content key;
(e) loading the content key to a register of a descrambler to decrypt the media content stream;
(f) preventing further loading of the content key from the key table to the register;
(g) decrypting a predefined portion of the encrypted media content stream with the content key in the register using the descrambler;
(h) clearing the content key from the register when decryption of the predefined portion is complete; and
(i) repeating steps (c) to (h) to decrypt a next predefined portion of the encrypted media content stream.