Procedure for monitoring the usage of a broadcasted content
US7779455B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 2004 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Sep 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H60/23
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method for monitoring the usage of a service by a communication device coupled to a tamper resistant module, in particular a smart card. A said service is transmitted from a resource able to communicate with said communication device by way of a network. The service comprises a plurality of encrypted data flow and its use comprises successive decryption steps of data flow by a respective first key EK, said first key EK being encrypted in the data flow and decrypted in the tamper resistant module by way of a second key KEK stored in said tamper resistant module or derived inside said module. The invention is characterized in that said method comprises the following steps: a. A counting step, in which a memory location stores a count of occurrences of decryption steps of said first key EK attached to a same service; b. A using step, in which said counter is used to prove the amount of data flow which has been decrypted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.