Patent ID: 8243926

Claim:
A transport stream encryption device, comprising: a general-purpose bus connecting the transport stream encryption device to a storage device; a detection unit for detecting headers including at least a TS header, and a PES header of a PES packet existing in a payload of a TS packet, a GOP header existing in a payload of a video PES packet from an input transport stream which is not encrypted; an encryption unit for encrypting a remaining part of the input transport stream except at least the headers which are detected and storing an encrypted transport stream, which includes the headers not being encrypted and the remaining part being encrypted, into the storage device through the general-purpose bus; a moving picture restoration unit for receiving the encrypted transport stream from the storage device through the general-purpose bus and for restoring a moving picture from the encrypted transport stream; a representative image generation unit for generating representative images corresponding to all or a part of GOPs respectively from the restored moving picture and storing the representative images to the storage device together with time codes which are related to the representative images; and a transport stream editing device, comprising: a detection unit for detecting the headers from the encrypted transport stream stored in the storage device; and an editing unit for editing the encrypted transport stream without decryption in such a way as to include a GOP selected by a user with reference to representative images in units of TS packets ranging from a TS packet where the GOP header is detected to a TS packet previous to a TS packet where a subsequent GOP header is detected out of TS packets having an identical PID.