Information recording method and apparatus, function recording method and apparatus, and information reproducing method and apparatus

• US 5,940,505 A
• Filed: 07/30/1996
• Issued: 08/17/1999
• Est. Priority Date: 07/31/1995
• Status: Expired due to Fees

• Current Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Original Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Inventors: Kanamaru, Hitoshi
• Primary Examiner(s): Hayes, Gail O.
• Assistant Examiner(s): SONG, HOSUK
• Application Number:
  US08/689,112
• Time in Patent Office: 1,113 Days
• Field of Search: 380/9, 380/4, 380/5, 380/19, 380/20
• US Class Current: 705/58
• 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 20/00231 wherein the key is obtained from a local external medium, e.g. a card
• 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 20/00347 wherein the medium identifier is used as a key
• CPC Class Codes: G11B 20/0084 wherein the usage restriction can be expressed as a specific time or date
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection

Abstract

A record signal corresponding to record information to be recorded to a record medium is scrambled, and the scrambled record signal is recorded to the record medium. The information recording method is provided with: generating a scramble function to scramble the record signal in correspondence with a record medium identification code, which is set in advance to identify the record medium; scrambling the record signal by use of the generated scramble function and outputting the scrambled record signal; recording the scrambled record signal and the record medium identification code corresponding to the scrambled record signal to the record medium; generating an inverse-scramble function to decipher the scrambled record signal on the basis of the generated scramble function; and outputting the generated inverse-scramble function and the record medium identification code corresponding to the generated inverse-scramble function as one set to the external.

Claims

1. A system for limiting reproduction of record information recorded on a first record medium, said system comprising:

(a) an information recording apparatus comprising;

a scramble function generating device for generating a scramble function by using a record medium identification code, the record medium identification code being used for identifying the first record medium;

a scrambling device for scrambling a record signal corresponding to the record information by using the generated scramble function; and

a record signal recording device for recording the scrambled record signal and the record medium identification code onto the first record medium,

(b) a function recording apparatus comprising;

a decode function storage device for storing a plurality of sets of the record medium identification code and a decode function;

an identification code reading device for reading the record medium identification code from the first record medium;

an identifying device for identifying the decode function corresponding to the record medium identification code read from the first record medium by comparing the record medium identification code read from the first record medium with the record medium identification code stored in the decode function storage device;

an inputting device for inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

a modifying device for modifying the identified decode function by using the input reproducing apparatus identification code; and

a decode function recording device for recording the modified decode function onto a second record medium, and

(c) the reproducing apparatus comprising;

an identification code storage device for storing the reproducing apparatus identification code;

a modified decode function reading device for reading the modified decode function from the second record medium;

a restoring device for restoring the decode function by using the modified decode function read from the second record medium and the reproducing apparatus identification code stored in the identification code storage device;

a record signal reading device for reading the scrambled record signal from the first record medium;

a decoding device for decoding the read scrambled record signal by using the restored decode function; and

a reproducing device for reproducing the decoded record signals.

2. A system according to claim 1, wherein the information recording apparatus further comprises:

a decode function generating device for generating the decode function on the basis of the scramble function; and

a sending device for sending a set of the record medium identification code and the decode function to the function recording apparatus.

3. A system according to claim 2, wherein the function recording apparatus further comprises:

a receiving device for receiving the set of the record medium identification code and the decode function from the information recording apparatus; and

an adding device for adding the received set of the record medium identification code and the decode function to the storage device.

4. A system according to claim 1, wherein the second record medium is an IC card.

5. A system for limiting reproduction of record information recorded on a record medium, said system comprising:

(a) an information recording apparatus comprising;

a scramble function generating device for generating a scramble function by using a record medium identification code, the record medium identification code being used for identifying the record medium;

a scrambling device for scrambling a record signal corresponding to the record information by using the generated scramble function; and

a record signal recording device for recording the scrambled record signal and the record medium identification code onto the record medium,

(b) a function recording apparatus comprising;

a decode function storage device for storing a plurality of sets of the record medium identification code and a decode function;

an identification code reading device for reading the record medium identification code from the record medium;

an identifying device for identifying the decode function corresponding to the record medium identification code read from the record medium by comparing the record medium identification code road from the record medium with the record medium identification code stored in the decode function storage device;

an inputting device for inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

a modifying device for modifying the identified decode function by using the input reproducing apparatus identification code; and

a decode function recording device for recording the modified decode function onto the record medium, and

(c) the reproducing apparatus comprising;

an identification code storage device for storing the reproducing apparatus identification code;

a modified decode function reading device for reading the modified decode function from the record medium;

a restoring device for restoring the decode function by using the modified decode function read from the record medium and the reproducing apparatus identification code stored in the identification code storage device;

a record signal reading device for reading the scrambled record signal from the record medium;

a decoding device for decoding the read scrambled record signal by using the restored decode function; and

a reproducing device for reproducing the decoded record signals.

6. A system according to claim 5, wherein the information recording apparatus further comprises:

a decode function generating device for generating the decode function on the basis of the scramble function; and

a sending device for sending a set of the record medium identification code and the decode function to the function recording apparatus.

7. A system according to claim 6, wherein the function recording apparatus further comprises:

a receiving device for receiving the set of the record medium identification code and the decode function from the information recording apparatus; and

an adding device for adding the received set of the record medium identification code and the decode function to the storage device.

8. A function recording apparatus for generating a modified decode function to be used for decoding a scrambled record signal recorded on a first record medium, and recording the modified decode function onto a second record medium, the first record medium having a record medium identification code to identify the first record medium itself, the function recording apparatus comprising:

a decode function storage device for storing a plurality of sets of the record medium identification code and a decode function;

an identification code reading device for reading the record medium identification code from the first record medium;

an identifying device for identifying the decode function corresponding to the record medium identification code read from the first record medium by comparing the record medium identification code read from the first record medium with the record medium identification code stored in the decode function storage device;

an inputting device for inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

a modifying device for modifying the identified decode function by using the input reproducing apparatus identification code; and

a decode function recording device for recording the modified decode function onto the second record medium.

9. A function recording apparatus according to claim 8 further comprising:

a receiving device for receiving the set of the record medium identification code and the decode function from an external apparatus; and

an adding device for adding the received set of the record medium identification code and the decode function to the storage device.

10. A function recording apparatus according to claim 8, wherein the second record medium is an IC card.

11. A function recording apparatus for generating a modified decode function to be used for decoding a scrambled record signal recorded on a record medium, and recording the modified decode function onto the record medium, the record medium having a record medium identification code to identify the record medium itself, the function recording apparatus comprising:

a decode function storage device for storing a plurality of sets of the record medium identification code and a decode function;

an identification code reading device for reading the record medium identification code from the record medium;

an identifying device for identifying the decode function corresponding to the record medium identification code read from the record medium by comparing the record medium identification code read from the record medium with the record medium identification code stored in the decode function storage device;

an inputting device for inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

a modifying device for modifying the identified decode function by using the input reproducing apparatus identification code; and

a decode function recording device for recording the modified decode function onto the record medium.

12. A function recording apparatus according to claim 11 further comprising:

a receiving device for receiving the set of the record medium identification code and the decode function from an external apparatus; and

an adding device for adding the received set of the record medium identification code and the decode function to the storage device.

13. A function recording method of generating a modified decode function to be used for decoding a scrambled record signal recorded on a first record medium, and recording the modified decode function onto a second record medium, the first record medium having a record medium identification code to identify the first record medium itself, the function recording method comprising the processes of:

storing a plurality of sets of the record medium identification code and a decode function into a decode function storage device;

reading the record medium identification code from the first record medium;

identifying the decode function corresponding to the record medium identification code read from the first record medium by comparing the record medium identification code read from the first record medium with the record medium identification code stored in the decode function storage device;

inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

modifying the identified decode function by using the input reproducing apparatus identification code; and

recording the modified decode function onto the second record medium.

14. A function recording method according to claim 13 further comprising the processes of:

receiving the set of the record medium identification code and the decode function from an external apparatus; and

adding the received set of the record medium identification code and the decode function to the storage device.

15. A function recording method of generating a modified decode function to be used for decoding a scrambled record signal recorded on a record medium, and recording the modified decode function onto the record medium, the record medium having a record medium identification code to identify the record medium itself, the function recording method comprising the processes of:

storing a plurality of sets of the record medium identification code and a decode function into a decode function storage device;

reading the record medium identification code from the record medium;

identifying the decode function corresponding to the record medium identification code read from the record medium by comparing the record medium identification code read from the record medium with the record medium identification code stored in the decode function storage device;

inputting a reproducing apparatus identification code, the reproducing apparatus identification code being used for identifying a reproducing apparatus;

modifying the identified decode function by using the input reproducing apparatus identification code; and

recording the modified decode function onto the record medium.

16. A function recording method according to claim 15 further comprising the processes of:

receiving the set of the record medium identification code and the decode function from an external apparatus; and

adding the received set of the record medium identification code and the decode function to the storage device.