Recording and reproducing apparatus and file transfer method

• US 7,664,021 B2
• Filed: 11/30/2005
• Issued: 02/16/2010
• Est. Priority Date: 11/30/2004
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Matsushita, Ken, Kokubo, Takashi, Kanazawa, Koji
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): HAN, CLEMENCE S
• Application Number:
  US11/289,418
• Publication Number:
  US 20060168135A1
• Time in Patent Office: 1,539 Days
• Field of Search: None
• US Class Current: 370/230
• 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 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• 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 20/00855 involving a step of exchanging information with a remote server
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: H04L 12/2805 Home Audio Video Interoperability [HAVI] networks
• CPC Class Codes: H04L 12/2834 Switching of information between an external network and a home network access arrangements H04L12/2856
• CPC Class Codes: H04L 2012/2849 Audio/video appliances
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04N 2005/91328 the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/781 on disks or drums
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8227 the additional signal being at least another television signal

Abstract

A recording and reproducing apparatus includes a file recorder, an interface, and controller which, upon receipt of content file with copy control information, records the content file in the recorder by adding thereto identification information M requesting transfer upon confirmation that a round-trip response time to a destination is not longer than a predetermined time, so that upon receipt of an instruction for transfer of the content file to an external device on the network, the controller determines whether the external device has a function of measuring and determining the round-trip response time to the destination, and in the case where the external device has function of measuring and determining the round-trip response time to the destination, transfers the content file to storage area of the external device, after measuring the round-trip response time and confirming that the measurement is not longer than predetermined time.

Claims

1. A recording and reproducing apparatus comprising:

a recorder configured to store a content file;

an interface configured to conduct communication with an external device on a network; and

a controller configured to;

upon receipt of the content file with copy control information, record the content file in the recorder by adding thereto identification information requesting transfer upon determination that a round-trip response time to a destination is not longer than a predetermined time;

upon receipt of an instruction for transfer of the content file to the external device, determine whether the external device has a capability to determine a round-trip response time;

when the external device has no function of measuring and determining a round-trip response time, rewrite the copy control information to “

No copy”

; and

if the external device has the capability, transfer the content file to a storage area of the external device, after determining that a round-trip response time to the external device is not longer than the predetermined time.

2. The recording and reproducing apparatus according to claim 1, further comprising a tuner configured to receive a broadcast signal and demodulate the broadcast signal into audio-visual information thereby to generate the content file.

3. The recording and reproducing apparatus according to claim 1, wherein

the interface has an interface for the IEEE1394 network and an interface for LAN having the function of measuring round-trip response time, and

if the content file has the identification information, the file transfer through the IEEE1394 interface is prohibited regardless of a transfer instruction applied thereto.

4. The recording and reproducing apparatus according to claim 1, wherein

the interface has an interface for the IEEE1394 network and an interface for LAN having function of measuring round-trip response time, and

the controller, upon receipt of an instruction to transfer the content file having the identification information through the IEEE1394 to the external device,

measures the round-trip response time to the external device by the LAN, and

transfers the content file to the external device through the IEEE1394 if the round-trip response time to the external device is not longer than the predetermined time.

5. The recording and reproducing apparatus according to claim 1, wherein the content file to be controlled by the controller includes MPEG2TS (Moving Picture Experts Group 2 Transport Stream).

6. The recording and reproducing apparatus according to claim 1, wherein the content file to be controlled by the controller includes MPEG2PS (Moving Picture Experts Group 2 Program Stream).

7. The recording and reproducing apparatus according to claim 1, wherein

the controller measures the round-trip response to the external device time after authentication and exchanging key information with the external device.

8. The recording and reproducing apparatus according to claim 1, wherein

the controller measures the round-trip response time to the external device while, at the same time, determining, by a certificate version for authentication, whether the external device has the function of measuring the round-trip response time.

9. The recording and reproducing apparatus according to claim 1, wherein

the controller measures the round-trip response time to the external device while, at the same time,

generating and transmitting a message authentication code encrypted from a generated random number, and

measuring the time before response as the round-trip response time.

10. A file transfer method in which a content file is transferred to an external device on a network in a recording and reproducing apparatus having a recording area and an interface, the method comprising:

receiving the content file with copy control information;

adding identification information requesting transfer after determination that a round-trip response time to a destination is not longer than a predetermined time;

recording the content file in the recording area;

determining, upon receipt of an instruction to transfer the content file to the external device on the network, whether the external device has a capability to determine a round-trip response time;

when the external device has no function of measuring and determining a round-trip response time, rewriting the copy control information to “

No copy”

; and

if the external device has the capability, transferring the content file to a storage area of the external device, after determining that a round-trip response time to the external device is not longer than the predetermined time.

11. The file transfer method according to claim 10, further comprising:

receiving a broadcast signal using a tuner;

demodulating the broadcast signal into audio-visual information; and

generating the content file from the audio-visual information.

12. The file transfer method according to claim 10, wherein

the interface has an interface for the IEEE1394 network and an interface for LAN having the function of measuring round-trip response time;

and

if the content file includes the identification information, the file transfer through the IEEE1394 interface is prohibited regardless of an applied transfer instruction.

13. The file transfer method according to claim 10, wherein

the interface includes an interface for the IEEE1394 network and an interface for LAN having a function of measuring a round-trip response time;

and

if the content file includes the identification information,

upon receipt of an instruction to transfer; and

upon determination that the round-trip response time to the external device, as measured by the LAN, is not longer than the predetermined time;

the content file is transferred to the external device through the IEEE1394.

14. The file transfer method according to claim 10, wherein the content file to be controlled includes MPEG2TS (Moving Picture Experts Group 2 Transport Stream).

15. The file transfer method according to claim 10, wherein the content file to be controlled includes MPEG2PS (Moving Picture Experts Group 2 Program Stream).

16. The file transfer method according to claim 10, wherein the external device round-trip response time is measured after authentication and exchanging key information with the external device.

17. The file transfer method according to claim 10, wherein

the destination round-trip response time is measured while at the same time determining, by a certificate version for authentication, whether the external device has a function of measuring the round-trip response time.

18. The file transfer method according to claim 10, wherein

the external device round-trip response time is measured while at the same time generating and transmitting a message authentication code encrypted from a generated random number and measuring the time before response as the round-trip response time.