Technology for the secure transmission of programming material in the trust domain, and stores

摘要

In order telecommunication network, the content which for example is received from cable TV network, not to be copied illegitimately in accordance with this invention, the trust domain which is protected is established. With the execution example which is illustrated, as for this trust domain, the device which it is related to the user which receives the content from cable TV network is included. Before being remembered in the device, using the content key which for example you follow 3DES encoding algorithm it can encode this content. Furthermore, 1st encoding content key version and 2nd encoding content key version is generated by encoding the content key respectively making use of the open key which it is related to the device in accordance with open key encoding method, and another open key which it is related to the user. These 1st encoding content key versions and 2nd encoding content key version, inside the storage unit of the device, it is remembered pertaining to the content which is encoded. This be able to move to the 2nd device from the 1st device, when also the 2nd content key version which the 2nd device is related to the same user, is encoded is offered, you can decipher the content which is encoded even inside the 2nd device.