Selective video playing system
US4930158A · kind A · utility
Inventor
Key dates
| Filing date | Aug 29, 1988 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Aug 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A classification code, recorded repeatedly along with program material, is recovered on playing a video recording, and used to inhibit replay if the recovered code matches any of a set of codes specified by the user. The codes which cause replay to be inhibited can be set by the user after entering a personal identity number. The user can optionally request that a code be recorded when recording a program. Signals are optionally provided so that an auxiliary device, such as a second video player, can be controlled in response to codes recovered. One application is to prevent children viewing certain video recordings without parental permission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.