Device having a digital interface and a network system using such a device and a copy protection method

• US 6,118,871 A
• Filed: 02/05/1999
• Issued: 09/12/2000
• Est. Priority Date: 07/15/1996
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Endoh, Kenjiro, Shimoda, Kenji, Okuyama, Takehiko
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US09/245,314
• Time in Patent Office: 585 Days
• Field of Search: 380/203, 380/204, 380/201
• US Class Current: 380/201
• 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 20/00224 wherein the key is obtained from a remote server
• 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 20/1217 on discs
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04N 2005/91314 the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
• CPC Class Codes: H04N 2005/91321 the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
• 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 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 2005/91371 the video color burst signal being modified
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4135 external recorder interface circuits between an apparatus for recording television signals and a television receiver H04N5/775
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 21/4367 Establishing a secure communication between the client and a peripheral device or smart card
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• 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 5/913 : for scrambling ; for copy protection

Abstract

A copy flag detecting circuit in a device detects the copy generation management information. This copy generation management information is inserted in the CIP header of the IEEE 1394 packet for transmission. The copy flag detector of the 1394 interface in the device detects the copy generation management information in the CIP header. According to the detection result, the copy generation managing circuit records new copy generation management information and the recording controlling circuit permits or prohibits recording. Thus, there is no need for a decoding circuit at a receiving device.

Claims

1. A device having a digital interface, comprising:

at least one detector for each data format to which at least one original signal in at least one predetermined data format is input, which detects copy generation management information contained in said at least one input original signal;

a sending interface, said sending interface comprising a format converter which converts said at least one original signal in said at least one predetermined data format to data in a data format common to a network bus, said network bus inserts copy generation management information based on a detection result of said at least one detector for each data format or based on the kind of at least one signal source device of said at least one detector into a signal after format conversion by said format converter with a data format corresponding to said data format of said network bus before sending said data to said network bus;

a receiving interface which receives a transmitted signal sent from said sending interface by said network bus and restores said data format of said received signal from said data format of said network bus to said original data format of said original signal before outputting;

a common detector which detects said copy generation management information as inserted into said received signal with said data format corresponding to said data format of said network bus;

a recording controller, according to said detection result of said common detector, which permits or prohibits recording of said at least one original signal in said at least one predetermined data format from said receiving interface; and

a copy generation manager which changes said copy generation management information detected by said common detector according to contents thereof, if said recording controller permits recording of said at least one original signal.

3. The device having a digital interface according to claim 1,

wherein said copy generation manager changes said copy generation management information contained in an output from said receiving interface to copy generation management information indicating a recording prohibition when said copy generation management information detected by said common detector indicates one time recording permission.

4. The device having a digital interface according to claim 1, further comprising:

a recording format converter which converts said output from said receiving interface to data in said data format corresponding to a recording format of a predetermined recording device.

2. A device having a digital interface, comprising:

a receiving interface which receives a transmitted signal, which is obtained by converting at least one original signal in at least one predetermined format containing copy generation management information to data in a data format of a network bus and into which said copy generation management information is inserted with a data format corresponding to said data format of said network bus by said network bus, and restores said data format of said received signal from said data format of said network bus to said original data format of said original signal before outputting;

a common detector which detects said copy generation management information as inserted into said received signal received with said data format corresponding to said data format of said network bus;

a recording controller, according to said detection result of said common detector, which permits or prohibits recording of said at least one original signal in said at least one predetermined data format from said receiving interface; and

a copy generation manager which changes said copy generation management information detected by said common detector according to contents thereof, if said recording controller permits recording of said at least one original signal.

5. The device having a digital interface according to claim 2,

wherein said copy generation manager changes said copy generation management information contained in an output from said receiving interface to copy generation management information indicating a recording prohibition when said copy generation management information detected by said common detector indicates one time recording permission.

6. The device having a digital interface according to claim 2, further comprising:

a recording format converter which converts said output from said receiving interface to data in said data format corresponding to a recording format of a predetermined recording device.