Macrovision Corporation
137Patents
18Active
137Granted
44Portfolio score
Filing activity: Nov 14, 1983 → Oct 17, 2007 · 17 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6381747B1 | Method for controlling copy protection in digital video networks | Electricity | 260 | Expired |
| US5513260A | Method and apparatus for copy protection for various recording media | Electricity | 258 | Expired |
| US5315448A | Copy protection for hybrid digital video tape recording and unprotected source material | Electricity | 246 | Expired |
| US5406626A | Radio receiver for information dissemenation using subcarrier | Physics | 195 | Expired |
| US6374036B1 | Method and apparatus for copy-once watermark for video recording | Electricity | 184 | Expired |
| US5659613A | Method and apparatus for copy protection for various recording media using a video finger print | Electricity | 158 | Expired |
| US6553127B1 | Method and apparatus for selective block processing | Electricity | 113 | Expired |
| US4631603A | Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof | Electricity | 110 | Expired |
| US5754649A | Video media security and tracking system | Physics | 103 | Expired |
| US5739864A | Apparatus for inserting blanked formatted fingerprint data (source ID, time/date) in to a video signal | Electricity | 102 | Expired |
| US7574723B2 | Home media network | Electricity | 91 | Expired |
| US6018374A | Method and system for preventing the off screen copying of a video or film presentation | Electricity | 90 | Expired |
| US5754648A | Video media security and tracking system | Physics | 90 | Expired |
| US7213228B2 | Methods and apparatus for implementing a remote application over a network | Electricity | 78 | Expired |
| US6931536B2 | Enhanced copy protection of proprietary material employing multiple watermarks | Electricity | 72 | Expired |
| US4695901A | Method and apparatus for removing pseudo-sync and/or agc pulses from a video signal | Electricity | 65 | Expired |
| US5229735A | Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals | Electricity | 65 | Expired |
| US6802006B1 | System and method of verifying the authenticity of dynamically connectable executable images | Physics | 63 | Expired |
| US5194965A | Method and apparatus for disabling anti-copy protection system in video signals | Electricity | 60 | Expired |
| US4819098A | Method and apparatus for clustering modifications made to a video signal to inhibit the making of acceptable videotape recordings | Electricity | 57 | Expired |
| US6510516B1 | System and method for authenticating peer components | Physics | 54 | Expired |
| US6381367B1 | Method and apparatus for compression compatible video fingerprinting | Physics | 53 | Expired |
| US7603022B2 | Networked personal video recording system | Electricity | 51 | Expired |
| US4577216A | Method and apparatus for modifying the color burst to prohibit videotape recording | Electricity | 47 | Expired |
| US5668603A | Video finger print method and apparatus | Electricity | 45 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.