Data copyright management system

• US 6,463,536 B2
• Filed: 06/05/2001
• Issued: 10/08/2002
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: Piracy Protection LLC (LF Capital Partners, LLC)
• Original Assignee: Mitsubishi Corporation
• Inventors: Saito, Makoto
• Primary Examiner(s): Peeso, Thomas R.
• Application Number:
  US09/873,453
• Publication Number:
  US 20010027522A1
• Time in Patent Office: 490 Days
• Field of Search: 713/171, 713/176, 713/180, 713/182, 380/278, 380/283
• US Class Current: 713/176
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G06F 2211/008 Public Key, Asymmetric Key, Asymmetric Encryption
• CPC Class Codes: G06F 2221/2101 Auditing as a secondary aspect
• CPC Class Codes: G06F 2221/2117 User registration
• CPC Class Codes: H04L 2209/605 Copy protection
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/0464 using hop-by-hop encryption, i.e. wherein an intermediate entity decrypts the information and re-encrypts it before forwarding it
• 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 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 63/126 the source of the received data
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
• CPC Class Codes: H04L 9/083 involving central third party, e.g. key distribution center [KDC] or trusted third party [TTP]
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/63345 by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/162 Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing

Abstract

A system is provided which manages the copyright of a plurality of data in a database. A data copyright management system is provided in which a primary user edits data which he or she obtains and supplies edited data to a secondary user. In a case where new data is produced by editing a plurality of encrypted data obtained from the database, and is encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edit program which is an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring use of data with the crypt key for use only when the editor is identified to be the valid user of the edited data. The system comprises a database and a key control center, and uses a primary copyright label, a first use permit key including a first crypt key, a second use permit key, a third crypt key, and a copyright management program. The primary user uses primary copyrighted data encrypted by using the first crypt key and supplied, by decrypting it with the first use permit key obtained from the key control center. The data is encrypted again by using the first use permit key when it is stored. The primary user edits the primary copyrighted data by obtaining a second use permit key from the key control center for editing the primary copyrighted data. The data being edited is encrypted and stored by using the second use permit key. At the completion of the editing, the primary user receives the third crypt key for secondary copyright as secondary exploitation right, encrypts the edited data with the third crypt key, and distributes it to a secondary user. The secondary user obtains the third crypt key and uses the edited data. In another system, in a case where a new data is produced by editing a plurality of data obtained from the database, and encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edit program which is an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring data use with a crypt key for use only when the editor is identified to be the valid user of the edited data.

Claims

1. A data copyright management system used for producing new data by editing a plurality of encrypted data, wherein

a first user obtains a plurality of encrypted data from a database and decrypts said data by using a crypt key supplied from said database;

new data is produced by editing said data decrypted;

said first user supplies both a crypt key for each of said plurality of encrypted data and edition program with digital signature as a use permit key to a second user;

said second user who receives the edited and encrypted data request use of said data by presenting the edition program with digital signature to a copyright management center; and

said copyright management center identifies the first user as an editor with the digital signature, and provides said′

second user with the crypt key for use when the editor is confirmed to be the first user.