TECHNICAL FIELD

The present disclosure relates to a content recording apparatus which encrypts and records multiplexed video signals and audio signals, and others.

BACKGROUND ART

An MPEG Media Transport (MMT)/Type-Length-Value (TLV) scheme is known as a multiplexing format where video signals and audio signals are treated as a single piece of digital data. PTL 1 discloses an MMT transmission system which multiplexes Internet Protcol (IP) packets including MMT Protcol (MMTP) packets in broadcast channels using a TLV scheme.

CITATION LIST

Patent Literature

PTL 1: Japanese Unexamined Patent Application Publication No. 2015-170972

SUMMARY OF THE INVENTION

Technical Problem

In the MMT/TLV scheme, the packet has a variable size. The method of recording contents having such a variable packet structure in a block unit having a fixed length in a recording medium is susceptible to examination.

This disclosure provides a content recording apparatus having a simplified recording operation.

Solution to Problem

The content recording apparatus according to one aspect of this disclosure includes an obtaining unit which obtains a content having a variable-length packet structure; an encrypter which generates encrypted data by encrypting the content; and a recorder which records the generated encrypted data in a block unit having a fixed length in a recording medium. The encrypted data includes an invalidated region unnecessary for reproduction of the content. The recorder records a size of the invalidated region in the recording medium.

It should be noted that these comprehensive or specific aspects may be implemented with a device, a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM, or may be implemented with any combination of devices, systems, methods, integrated circuits, computer programs, and recording media.

Advantageous Effect of Invention

This disclosure provides a content recording apparatus having a simplified recording operation.

