Recording method of digital magnetic recording medium for copyright protection and variable speed playback
US5832084A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Jan 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2005/91364
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a recording method of a digital magnetic recording medium for a copyright protection and a variable speed playback when a user records a digital broadcasting program by a digital video cassette recorder (DVCR) or variable speed playback of a rental tape while performing a copyright protection function, a video track of a video tape is separated into a scrambled data region where scrambled data is recorded and a descrambling region where descrambling information for descrambing the scrambled data is recorded to record the video data on the corresponding region. When this method is adopted with a proper copyright protection system, the copyright of the program provider can be protected, and the lowering of the performance is also minimized during the user's variable speed playback of the video tape to which the copyright protection function is adopted, thereby satisfying both the program provider and the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.