Patent ID: 7506367
Filing Date: 2009-03-17
Classification: G06F,H04L

Abstract:
1. A content management method for managing content data provided to user equipment, comprising the steps of: storing a content key encrypted with a first storage key, content data encrypted with the content key, and a second storage key in the user equipment, wherein the second storage key, is encrypted with a public key for a key management unit for management of the storage keys to generate a third storage key and the third storage key is stored in the user equipment; sending the encrypted content key and the second storage key to the key management unit; at the key management unit, decrypting the encrypted content key using the first storage key, the first storage key being stored in the key management unit; encrypting the decrypted content key using the second storage key; sending the content key encrypted with the second storage key to the user equipment; and at the user equipment, decrypting the encrypted content key using the second storage key and decrypting the content data using the decrypted content key.