Digital information recording-reproducing apparatus

• US 6,249,639 B1
• Filed: 02/25/1999
• Issued: 06/19/2001
• Est. Priority Date: 06/07/1993
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Arai, Takao, Amada, Nobutaka, Yamazaki, Shigeru, Okamoto, Hiroo, Noguchi, Takaharu
• Primary Examiner(s): NGUYEN, HUY THANH
• Application Number:
  US09/257,187
• Time in Patent Office: 845 Days
• Field of Search: H04/N.576, 386/46, 386/94, 386/95, 386/112, 360/60, 380/201
• US Class Current: 386/323
• CPC Class Codes: G11B 15/1875 adaptations for special effects or editing signal processing or indexing therefor G11B27/00
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• 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 20/00188 involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00246 wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
• CPC Class Codes: G11B 20/00557 wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00695 said measures preventing that data are read from the recording medium
• CPC Class Codes: G11B 20/0071 involving a purchase action
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: G11B 2220/90 Tape-like record carriers
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/3036 Time code signal
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/78263 for recording on tracks inclined relative to the direction of movement of the tape
• CPC Class Codes: H04N 5/919 by dividing samples or signal segments, e.g. television lines, among a plurality of recording channels
• CPC Class Codes: H04N 5/9201 involving the multiplexing of an additional signal and the video signal
• CPC Class Codes: H04N 5/9261 involving data reduction
• CPC Class Codes: H04N 5/9265 with processing of the sound signal

Abstract

A digital information recording-reproducing apparatus for recording and reproducing a digital information signal which includes a recording circuit for recording the digital information signal together with control information, and a reproducing circuit for detecting the recorded control information at a time the recorded digital information signal is to be reproduced, and reproducing the recorded digital information signal only if the detected control information satisfies a predetermined condition.

Claims

1. A digital information recording-reproducing apparatus which records and reproduces a digital information signal, comprising:

a recorder which records the digital information signal together with control information; and

a reproducer which detects the recorded control information at a time the recorded digital information signal is to be reproduced, and reproduces the recorded digital information signal only if the detected control information satisfies a predetermined condition;

wherein the control information includes type information specifying a type of the digital information signal and a predetermined condition under which the digital information signal is allowed to be reproduced;

wherein the reproducer reproduces the recorded digital information signal only if the predetermined condition specified by the type information is satisfied at a time the recorded digital information signal is to be reproduced;

wherein the predetermined condition specified by the type information includes a time period during which the recorded digital information signal is allowed to be reproduced; and

wherein the reproducer reproduces the recorded digital information signal only if a time at which the recorded digital information is to be reproduced is within the time period during which the recorded digital information signal is allowed to be reproduced.

2. A digital information recording-reproducing apparatus according to claim 1, wherein the recorded digital information signal is an encrypted digital information signal;

wherein the control information further includes decryption information for decrypting the encrypted digital information signal; and

wherein the reproducer decrypts the encrypted digital information signal based on the decryption information when the reproducer reproduces the recorded digital information signal.

3. A digital information reproducing apparatus which reproduces a recorded digital information signal having control information recorded therewith, comprising;

a detector which detects the recorded control information; and

a reproducer which reproduces the recorded digital information signal only if the detected control information satisfies a predetermined condition;

wherein the control information includes type information specifying a type of the digital information signal and a predetermined condition under which the digital information signal is allowed to be reproduced;

wherein the reproducer reproduces the recorded digital information signal only if the predetermined condition specified by the type information is satisfied at a time the recorded digital information signal is to be reproduced;

wherein the predetermined condition specified by the type information includes a time period during which the recorded digital information signal is allowed to be reproduced; and

wherein the reproducer reproduces the recorded digital information signal only if a time at which the recorded digital information is to be reproduced is within the time period during which the recorded digital information signal is allowed to be reproduced.

4. A digital information reproducing apparatus according to claim 3, wherein the recorded digital information signal is an encrypted digital information signal;

wherein the control information further includes decryption information for decrypting the encrypted digital information signal; and

wherein the reproducer decrypts the encrypted digital information signal based on the decryption information.