Digital signal transmitting method, digital signal receiving apparatus, and recording medium
US5721778A · kind A · utility
32Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8166
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital signal transmitting method, a digital signal receiving apparatus, and a recording medium which ensure the security of fee-charged software information. When an image providing predetermined services is transmitted, a band-compression coded digital video signal is given first-encryption processing and then the digital signal is further given encryption processing and transmitted. Therefore, double security can be added to the video signal and a digital signal transmitting method where its security is more firmly ensured can be realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.