Patent ID: 8275998
Filing Date: 2012-09-25
Classification: H04L

Abstract:
1. A key distribution device that distributes key data used in encryption of content to encryption devices, the key distribution device comprising: an acquiring unit operable to acquire, from a second encryption device, second license information that includes (i) first license information proving that a first encryption device is permitted to use the content and (ii) certification information proving that encryption of the content has been outsourced from the first encryption device to the second encryption device; a first judging unit operable to perform a first judgment for judging, using the certification information, whether or not the encryption of the content has been outsourced from the first encryption device to the second encryption device; a second judging unit operable to perform a second judgment for judging, using the first license information, whether or not the first encryption device is permitted to use the content; and a transmission unit operable to transmit the key data to the second encryption device if a result of the first judgment and a result of the second judgment are in the affirmative.