US Patent No: 7,116,785

Number of patents in Portfolio can not be more than 2000

Data processing system, data processing method, and program providing medium

ALSO PUBLISHED AS: 20020094088
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Importance

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Abstract

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The inventive data processing apparatus enables own memory device to store a plurality of key distribution approval data files each containing such a header data comprising a number of 'link-count' data units each designating actual number of applicable contents data per decodable contents key based on an enabling key block (EKB) distribution key enciphering key (KEK) enciphered by a corresponding enabling key block (EKB) provided for by a hierarchy key tree structure. When storing a plurality of the enabling key blocks (EKB) in a memory device, such a key enciphering key (KEK) contained in an enabling key block (EKB) having a number of link-count data units is previously decoded and stored in the memory device. By way of applying the stored (KEK) when utilizing contents data, the enabling key block (EKB) processing step is deleted, whereby promoting higher efficiency in the utilization of contents data.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SONY CORPORATIONTOKYO, JP27549

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Okaue, Takumi Kanagawa, JP 78 798

Cited Art Landscape

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
* 6,609,116 System and method for securely updating copy-protected media 29 1999
 
SUN MICROSYSTEMS, INC. (1)
* 6,049,878 Efficient, secure multicasting with global knowledge 145 1998
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
INTELLECTUAL VENTURES I LLC (11)
7,950,066 Method and system for restricting use of a clipboard application 39 2001
8,176,334 Document security system that permits external users to gain access to secured files 6 2002
7,930,756 Multi-level cryptographic transformations for securing digital assets 11 2003
8,127,366 Method and apparatus for transitioning between states of security policies used to secure electronic documents 6 2003
7,913,311 Methods and systems for providing access control to electronic data 18 2007
8,543,827 Methods and systems for providing access control to secured data 1 2008
RE43906 Method and apparatus for securing digital assets 2 2008
8,266,674 Method and system for implementing changes to security policies in a distributed security system 0 2009
8,327,138 Method and system for securing digital assets using process-driven security policies 2 2010
8,341,407 Method and system for protecting electronic data in enterprise environment 1 2011
8,341,406 System and method for providing different levels of key security for controlling access to secured items 0 2011
 
INTELLECTUAL VENTURES I LLC (7)
8,065,713 System and method for providing multi-location access management to secured items 18 2002
7,921,288 System and method for providing different levels of key security for controlling access to secured items 25 2002
8,006,280 Security system for generating keys from access rules in a decentralized manner and methods therefor 11 2002
7,921,450 Security system using indirect key generation from access rules and methods therefor 16 2002
* 8,707,034 Method and system for using remote headers to secure electronic files 1 2003
8,918,839 System and method for providing multi-location access management to secured items 0 2011
8,739,302 Method and apparatus for transitioning between states of security policies used to secure electronic documents 1 2012
 
SONY CORPORATION (2)
* 7,503,073 Information managing apparatus and method, recording medium, and program 7 2003
* 7,861,313 Information managing apparatus and method, recording medium, and program 0 2007
 
FUJITSU SEMICONDUCTOR LIMITED (1)
* 8,306,230 Information processing apparatus playing encrypted content distributed through network 1 2007
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
* 7,590,868 Method and apparatus for managing encrypted data on a computer readable medium 4 2005
 
MOTOROLA MOBILITY LLC (1)
* 7,386,128 Conditional access system providing access to multiple programs or services 6 2004
 
PERVASIVE SECURITY SYSTEM, INC. (1)
7,921,284 Method and system for protecting electronic data in enterprise environment 16 2002
 
Other [Check patent profile for assignment information] (1)
8,943,316 Document security system that permits external users to gain access to secured files 0 2012
* Cited By Examiner

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