Recording apparatus and reproducing apparatus

• US 20030097453A1
• Filed: 07/12/2002
• Published: 05/22/2003
• Est. Priority Date: 10/22/2001
• Status: Abandoned Application

• Current Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Fuchigami, Norihiko, Shikunami, Juichi
• Application Number:
  US10/193,274
• Publication Number:
  US 20030097453A1
• Time in Patent Office: Days
• US Class Current: 709/229
• 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 20/00746 wherein the usage restriction can be expressed as a specific number

Abstract

A data recording apparatus includes a first device for changing a present date represented by first information, and a second device for limiting a number of times the first device changes the present date represented by the first information. The data recording apparatus may further include a third device receiving data, a fourth device for deciding whether or not the present date represented by the first information precedes a date of feed of the data which is equal to a date of the reception of the data by the third device, and a fifth device for, when the fourth device decides that the present date represented by the first information precedes the date of feed of the data, correcting the present date represented by the first information into agreement with the date of feed of the data.

Claims

1. A data recording apparatus comprising:

first means for changing a present date represented by first information; and

second means for limiting a number of times the first means changes the present date represented by the first information.

2. A data recording apparatus as recited in claim 1, further comprising:

third means for receiving data;

fourth means for deciding whether or not the present date represented by the first information precedes a date of feed of the data which is equal to a date of the reception of the data by the third means; and

fifth means for, when the fourth means decides that the present date precedes the date of feed of the data, correcting the present date represented by the first information into agreement with the date of feed of the data.

3. A data recording apparatus as recited in claim 2, further comprising sixth means for recording the data, second information, and third information on a recording medium, the second information representing the date of feed of the data, the third information representing a time limit for permission of playback of the data.

4. A recording medium on which data, second information, and third information are recorded by the data recording apparatus of claim 3.

5. A data reproducing apparatus comprising:

first means for changing a present date represented by first information;

second means for limiting a number of times the first means changes the present date represented by the first information;

third means for reading out data, second information, and third information from a recording medium, the second information representing a date of feed of the data, the third information representing a time limit for permission of playback of the data;

fourth means for deciding whether or not the present date represented by the first information is between the time limit which is represented by the third information and the date of feed of the data which is represented by the second information;

fifth means for, when the fourth means decides that the present date is between the time limit and the date of feed of the data, permitting playback of the data; and

sixth means for, when the fourth means decides that the present date is not between the time limit and the date of feed of the data, inhibiting playback of the data.

6. A data reproducing apparatus as recited in claim 5, further comprising:

seventh means for deciding whether or not the present date represented by the first information precedes the date of feed of the data which is represented by the second information; and

eighth means for, when the seventh means decides that the present date precedes the date of feed of the data, correcting the present date represented by the first information into agreement with the date of feed of the data which is represented by the second information.