CONTENTGUARD HOLDINGS, INC.
138Patents
55Active
138Granted
48Portfolio score
Filing activity: Oct 10, 1997 → Aug 27, 2015 · 30 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6236971A | System for controlling the distribution and use of digital works using digital tickets | Emerging Cross-Sectional Technologies | 544 | Expired |
| US6233684A | System for controlling the distribution and use of rendered digital works through watermaking | Electricity | 499 | Expired |
| US6714921B2 | System for controlling the distribution and use of digital works using digital tickets | Emerging Cross-Sectional Technologies | 110 | Expired |
| US6931545B1 | Systems and methods for integrity certification and verification of content consumption environments | Electricity | 107 | Expired |
| US7043453B2 | Method and system for conducting transactions between repositories using a repository transaction protocol | Emerging Cross-Sectional Technologies | 107 | Expired |
| US6519700B1 | Self-protecting documents | Physics | 99 | Expired |
| US6824051B2 | Protected content distribution system | Electricity | 98 | Expired |
| US6885748B1 | System and method for protection of digital works | Electricity | 95 | Expired |
| US7073199B1 | Document distribution management method and apparatus using a standard rendering engine and a method and apparatus for controlling a standard rendering engine | Electricity | 74 | Expired |
| US7085741B2 | Method and apparatus for managing digital content usage rights | Emerging Cross-Sectional Technologies | 73 | Expired |
| US7206765B2 | System and method for supplying and managing usage rights based on rules | Emerging Cross-Sectional Technologies | 72 | Expired |
| US6708157B2 | System for controlling the distribution and use of digital works using digital tickets | Emerging Cross-Sectional Technologies | 69 | Expired |
| US7068787B1 | System and method for protection of digital works | Electricity | 67 | Expired |
| US6957194B2 | Method for printing digital works | Emerging Cross-Sectional Technologies | 61 | Expired |
| US7028009B2 | Method and apparatus for distributing enforceable property rights | Emerging Cross-Sectional Technologies | 60 | Expired |
| US6912294B2 | Multi-stage watermarking process and system | Electricity | 57 | Expired |
| US7113912B2 | Composite digital works having usage rights and method for creating the same | Emerging Cross-Sectional Technologies | 57 | Expired |
| US7024392B2 | Method for controlling use of database content | Emerging Cross-Sectional Technologies | 54 | Expired |
| US6976009B2 | Method and apparatus for assigning consequential rights to documents and documents having such rights | Emerging Cross-Sectional Technologies | 53 | Expired |
| US6895503B2 | Method and apparatus for hierarchical assignment of rights to documents and documents having such rights | Physics | 50 | Expired |
| US6963859B2 | Content rendering repository | Emerging Cross-Sectional Technologies | 48 | Expired |
| US7523072B2 | System for controlling the distribution and use of digital works | Emerging Cross-Sectional Technologies | 48 | Expired |
| US6959290B2 | Method and apparatus for tracking states of digital works | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6954738B2 | Method and apparatus for distributing enforceable property rights | Emerging Cross-Sectional Technologies | 47 | Expired |
| US6937726B1 | System and method for protecting data files by periodically refreshing a decryption key | Electricity | 45 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.