Patent ID: 8737611
Filing Date: 2014-05-27
Classification: H04L,H04N

Abstract:
1. A data delivery device that encrypts video content data and delivers the encrypted video content data to a data receiving device, the data delivery device comprising: a data divider for setting encryption status information for each data item of the video content data representing a single entity, wherein the setting of the encryption status information is made by assigning encryption status information having values including a predefined value in a predefined cyclic sequence, or by assigning encryption status information having the predefined value to the data items at predefined sequential positions, and wherein the data divider outputs the data items having the encryption status information with the predefined value, as a first set of data items, and the data items having the encryption status information without the predefined value, as a second set of data items; a first encryptor for encrypting the first set of the data items, without encrypting the remaining second set of the data items, the first encryptor including a first encryption decision unit that uses the encryption status information to decide whether the first encryptor should encrypt each data item; a storage unit for storing the encrypted first set of data items and the unencrypted second set of data items, pending delivery to the data receiving device; and a second encryptor for encrypting the second set of data items, without encrypting the first set of data items, when they are taken from the storage unit and delivered to the data receiving device, the second encryptor including a second encryption decision unit that uses the encryption status information to decide whether the second encryptor should encrypt each data item.