Patent ID: 9722992
Date: 2017-08-01
CPC Classifications: G06F,H04L

Claim:
1. Device for decrypting protected content and for providing the decrypted content for playback, the device comprising: a memory; a processor operating in a secure environment for carrying out cryptographic operations including the decryption of the protected content using decryption information, and the device being configured to install therein at least one client software module assigned to a provider of the protected content, the client software module being adapted to forward encrypted content-decryption-information for decrypting the protected content of the provider to the processor; wherein the processor is adapted to store a public key assigned to the provider in the memory and to authenticate at least one link key provided by the content provider using the stored public key, wherein, the processor is adapted to receive a protected software image of the client software module and to initiate the installation of the client software module in the device upon having decrypted and/or validated the protected software image by means of a link key authenticated using the stored public key or by means of a key of a key ladder derived from the authenticated link key, and wherein, during execution of the installed client software module, the secure module processor being adapted to decrypt the encrypted content-decryption-information by means of the link key authenticated using the stored public key or by means of the key of the key ladder derived from the authenticated link key.