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Class Information
Number: 705/57
Name: Data processing: financial, business practice, management, or cost/price determination > Business processing using cryptography > Usage protection of distributed data files > Copy protection or prevention
Description: Subject matter which prevents rerecording of a distributed data file.

Sub-classes under this class:

Class Number Class Name Patents
705/58 Having origin or program id 423

Patents under this class:
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Patent Number Title Of Patent Date Issued
6898578 Recording apparatus for recording digital information May. 24, 2005
6889206 Method for computer network operation providing basis for usage fees May. 3, 2005
6889208 Contents sale system May. 3, 2005
6889209 Method and apparatus for protecting information and privacy May. 3, 2005
6889210 Method and system for managing security tiers May. 3, 2005
6885748 System and method for protection of digital works Apr. 26, 2005
6885629 Recordable optical disk including an auxiliary information presence indicator Apr. 26, 2005
6882979 Generating revenue for the use of softgoods that are freely distributed over a network Apr. 19, 2005
6882987 Methods and apparatus for transmitting and receiving a decoding key encoded with specific information to decode encrypted information of a record medium Apr. 19, 2005
6873975 Content usage control system, content usage apparatus, computer readable recording medium with program recorded for computer to execute usage method Mar. 29, 2005
6873976 Secured purchasing system Mar. 29, 2005
6871192 System and method for preventing unauthorized use of protected software utilizing a portable security device Mar. 22, 2005
6868494 Reproducing apparatus and information distribution system Mar. 15, 2005
6868495 One-time pad Encryption key Distribution Mar. 15, 2005
6865551 Removable content repositories Mar. 8, 2005
6865552 Data copying system, data copying apparatus, data copying method, and recording medium Mar. 8, 2005
6865553 Copy protection apparatus and method Mar. 8, 2005
6865675 Method and apparatus for use of a watermark and a unique time dependent reference for the purpose of copy protection Mar. 8, 2005
6865677 Contents rendering control method, contents reproducing equipment, and contents distribution equipment Mar. 8, 2005
6862583 Authenticated secure printing Mar. 1, 2005
6859427 Medium, apparatus, and method related to encryption resultant information Feb. 22, 2005
6859789 Information recording medium and information processing device Feb. 22, 2005
6859790 Data distribution system and method thereof, data processing device, data control device, and machine-readable recording medium recording distribution data Feb. 22, 2005
6859793 Software license reporting and control system and method Feb. 22, 2005
6856977 Method and system for proving ownership of digital data Feb. 15, 2005
6857071 System and method for distributing digital works, apparatus and method for reproducing digital works, and computer program product Feb. 15, 2005
6850910 Active data hiding for secure electronic media distribution Feb. 1, 2005
6850914 Revocation information updating method, revocation informaton updating apparatus and storage medium Feb. 1, 2005
6850915 Method for controlling distribution and use of software products with net-work-connected computers Feb. 1, 2005
6847719 Limiting receiver access to secure read-only communications over a network by preventing access to source-formatted plaintext Jan. 25, 2005
6847949 Indicator system for screening protected material Jan. 25, 2005
6847950 Contents managing method and contents managing apparatus Jan. 25, 2005
6848049 Method and apparatus for the authentication of integrated circuits Jan. 25, 2005
6842521 Method and apparatus to control copying from a drive device to a data reproducing device Jan. 11, 2005
6842741 Recording medium with electronic ticket definitions recorded thereon and electronic ticket processing methods and apparatuses Jan. 11, 2005
6839689 Systems and methods for guaranteeing the protection of private information Jan. 4, 2005
6839847 Information processing equipment and IC card Jan. 4, 2005
6832319 Content guard system for copy protection of recordable media Dec. 14, 2004
6832358 System and method for providing burst licensing in a circuit simulation environment Dec. 14, 2004
6826281 Storage-encryption-retrieval device and method with resulting business processes Nov. 30, 2004
6826699 Method and apparatus for performing authentication and key exchange protocols with multiple sink devices Nov. 30, 2004
6823075 Authentication watermarks for printed objects and related applications Nov. 23, 2004
6820063 Controlling access to content based on certificates and access predicates Nov. 16, 2004
6813709 Method and apparatus for recorded digital data protection via media volume Nov. 2, 2004
6810200 Digital data processing device that restricts usage of data present on a recording medium Oct. 26, 2004
6810387 Copy prevention apparatus and method in digital broadcasting receiving system Oct. 26, 2004
6810388 Digital contents copying inhibition apparatus, digital contents copying inhibition method, and computer products Oct. 26, 2004
6810389 System and method for flexible packaging of software application licenses Oct. 26, 2004
6802000 System for authenticating access to online content referenced in hardcopy documents Oct. 5, 2004

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