The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2005
Filed:
Jun. 02, 2000
George T. Hutchings, Doylestown, PA (US);
Eric Sprunk, Carlsbad, CA (US);
Lawrence D. Vince, Lansdale, PA (US);
Richard Dicolli, Broomhall, PA (US);
Mark Depietro, Harleysville, PA (US);
George T. Hutchings, Doylestown, PA (US);
Eric Sprunk, Carlsbad, CA (US);
Lawrence D. Vince, Lansdale, PA (US);
Richard DiColli, Broomhall, PA (US);
Mark DePietro, Harleysville, PA (US);
General Instrument Corporation, Horsham, PA (US);
Abstract
A system for streaming encrypted conditional access (CA) data, such as control words, from a primary or master conditional access provider (CAP) to one or more secondary CAPS. The primary CAP encrypts content (program data) that is to be access-controlled, such as a television program, according to the associated CA data. A first group of user terminals is compatible with the CA data of the primary CAP. The CA data is then provided to the secondary CAPs to provide corresponding CA data for the content in the secondary CAPs' associated formats for compatibility with other groups of terminals. The invention can be used in any packet-based distribution system, including a broadband television network headend, and avoids the need for the secondary CAPs to request the control words on an as-needed basis. Moreover, the CA data for a current crypto-period and a number of future crypto-periods are provided in a 'sliding window' to allow the secondary CAP to begin preparing its CA data in advance. Moreover, the CA data can be provided to the secondary CAPs on a real-time basis, or well beforehand when the content is pre-encrypted and stored, e.g., at a file server.