Information recording apparatus and method, information reproduction apparatus and method, information recording medium, program storage medium and program

• US 7,813,249 B2
• Filed: 01/27/2003
• Issued: 10/12/2010
• Est. Priority Date: 01/28/2002
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kato, Motoki
• Primary Examiner(s): Tran; Thai
• Assistant Examiner(s): Dang; Hung Q
• Application Number:
  US10/351,832
• Publication Number:
  US 20030219230A1
• Time in Patent Office: 2,815 Days
• Field of Search: 386/94, 386/95, 380/201, 380/217, 380/281, 380/203, 713/193
• US Class Current: 369/94
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00507 wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/00775 wherein said copy control information is encoded in an encryption mode indicator [EMI]
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

An information recording apparatus and method and an information reproduction apparatus and method enable security information of AV data to be managed appropriately. A copy control information detection section acquires copy control information (CCI_i) of a video signal supplied from a terminal and outputs it to a controller. The controller determines the values of is_not_free and is_encrypted based on the copy control information supplied from the copy control information detection section and outputs the values to a source packetization section. Is_not_free and is_encrypted represent a limitation to copying and an encryption mode of data recorded on a recording medium, respectively, and are described in the header of a source packet produced by a source packetization section. The source packet produced by the source packetization section is encrypted in accordance with the value of is_encrypted, undergoes a predetermined process by an encryption section, and is then recorded onto the recording medium.

Claims

1. An information recording apparatus, comprising:

an acquisition unit operable to acquire first copy control information representative of whether recording of input contents onto a recording medium is permitted;

a production unit operable to produce, based on the first copy control information, control information representing whether copying of the contents recorded on the recording medium is permitted, whether the contents are in an encrypted state regardless of whether the copying of the contents is permitted, and whether encryption of the contents should be compelled;

wherein the control information is capable of representing three states permitting free copying of the contents recorded on the recording medium;

wherein, when the control information represents that free copying of the contents recorded on the recording medium is permitted, the control information is capable of representing (i) not compelling encryption and the contents are not encrypted, (ii) not compelling encryption and the contents are encrypted; and

(iii) compelling encryption and the contents are encrypted;

wherein the control information consists of two bits in a packet header of an MPEG (motion picture experts group) transport stream containing the contents; and

a recording unit operable to record the control information onto the recording medium together with the contents;

wherein the MPEG transport stream is comprised of a plurality of aligned units, each aligned unit is comprised of thirty-two source packets, each source packet is comprised of the packet header and a transport packet containing a portion of the contents, the packet header further contains an arrival time stamp of 30 bits indicating the time at which the contents arrive at a decoder.

2. An information recording apparatus according to claim 1, wherein the contents are formatted into the MPEG transport stream, and the first copy control information is placed in the packet header of the MPEG transport stream.

3. An information recording apparatus according to claim 2, further comprising an encryption unit operable to encrypt the contents based on an encryption identification information, wherein, when the contents are to be recorded in a predetermined unit composed of a plurality of packets, the encryption unit encrypts data of a unit succeeding the packet header of an initial packet of the unit, and does not encrypt data of the packet header of the initial packet of the unit.

4. An information recording apparatus according to claim 1, wherein, when the first copy control information represents that recording of the contents onto the recording medium is permitted only once, the production unit produces second copy control information representing that the contents cannot be copied any more and produces encryption identification information representing that the contents are in an encrypted state.

5. An information recording apparatus according to claim 1, wherein, when the first copy control information represents that free recording of the contents is permitted, the production unit produces second copy control information representing that free recording of the contents is permitted and produces encryption identification information representing that the contents are in an encrypted state.

6. An information processing apparatus according to claim 1, wherein the control information includes second copy control information representative of whether the copying of the contents recorded on the recording medium is permitted and encryption identification information representative of whether the contents are in an encrypted state.

7. An information recording apparatus according to claim 6, further comprising an encryption unit operable to encrypt the contents based on the encryption identification information, the recording unit recording the contents encrypted by the encryption unit onto the recording medium.

8. An information recording method, comprising:

acquiring copy control information representative of whether recording of input contents onto a recording medium is permitted;

producing, based on the copy control information, control information representing whether copying of the contents recorded on the recording medium is permitted, whether the contents are in an encrypted state regardless of whether the copying of the contents is permitted, and whether encryption of the contents should be compelled;

wherein the control information is capable of representing three states permitting free copying of the contents recorded on the recording medium;

wherein, when the control information represents that free copying of the contents recorded on the recording medium is permitted, the control information is capable of representing (i) not compelling encryption and the content are not encrypted, (ii) not compelling encryption and the contents are encrypted, and (iii) compelling encryption and the contents are encrypted;

wherein the control information consists of two bits in a packet header of an MPEG (motion picture experts group) transport stream containing the contents; and

recording the control information onto the recording medium together with the contents;

wherein the MPEG transport stream is comprised of a plurality of aligned units, each aligned unit is comprised of thirty-two source packets, each source packet is comprised of the packet header and a transport packet containing a portion of the contents, the packet header further contains an arrival time stamp of 30 bits indicating the time at which the contents arrive at a decoder.

9. An information reproduction apparatus for reproducing contents recorded on a recording medium, comprising:

an acquisition unit operable to acquire copy control information added to the contents based on whether recording of the contents onto the recording medium was permitted and control information representing whether copying of the contents is permitted, whether the contents are in an encrypted state regardless of whether the copying of the contents is permitted, and whether encryption of the contents should be compelled;

wherein the control information is capable of representing three states permitting free copying of the contents recorded on the recording medium;

wherein, when the control information represents that free copying of the contents recorded on the recording medium is permitted, the control information is capable of representing (i) not compelling encryption and the contents are not encrypted;

(ii) not compelling encryption and the contents are encrypted; and

(iii) compelling encryption and the contents are encrypted;

wherein the control information consists of two bits in a packet header of an MPEG (motion picture experts group) transport stream containing the contents; and

a decrypting unit operable to decrypt the contents when the control information represents that the contents are in an encrypted state;

wherein the MPEG transport stream is comprised of a plurality of aligned units, each aligned unit is comprised of thirty-two source packets, each source packet is comprised of the packet header and a transport packet containing a portion of the contents, the packet header further contains an arrival time stamp of 30 bits indicating the time at which the contents arrive at a decoder.

10. An information reproduction apparatus according to claim 9, further comprising an output unit operable to add to the contents relationship information representative of a matching relationship between the copy control information and an encryption mode based on the copy control information to produce a predetermined packet and to output the predetermined packet.

11. An information reproduction apparatus according to claim 10, further comprising a reproducing unit operable to reproduce the predetermined packet output from the output unit based on the relationship information.

12. An information reproduction apparatus according to claim 10, wherein the acquisition unit acquires, as the control information, information representative of whether the contents are in an encrypted state and information representative of whether encryption of the contents should be compelled, and the output unit outputs the relationship information based on the information acquired by the acquisition unit.

13. A method for reproducing contents recorded on a recording medium, comprising:

acquiring copy control information added to the contents based on whether recording of the contents onto the recording medium was permitted and control information representing whether copying of the contents is permitted, whether the contents are in an encrypted state regardless of whether the copying of the contents is permitted, and whether encryption of the contents should be compelled;

wherein the control information is capable of representing three states permitting free copying of the content recorded on the recording medium;

wherein, when the control information represents that free copying of the contents recorded on the recording medium is permitted, the control information is capable of representing (i) not compelling encryption and the contents are not encrypted, (ii) not compelling encryption and the contents are encrypted, and (iii) compelling encryption and the contents are encrypted;

wherein the control information consists of two bits in a packet header of an MPEG (motion picture experts group) transport stream containing the contents; and

decrypting the contents when the control information represents that the contents are in an encrypted state;

wherein the MPEG transport stream is comprised of a plurality of aligned units, each aligned unit is comprised of thirty-two source packets, each source packet is comprised of the packet header and a transport packet containing a portion of the contents, the packet header further contains an arrival time stamp of 30 bits indicating the time at which the contents arrive at a decoder.