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:
Oct. 08, 1996
Filed:
Sep. 27, 1993
Applicant:
Inventors:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
380 16 ; 380 20 ;
Abstract
The device of the invention for a pay-television system comprises an emitter and several receivers using 'smart cards'. In addition to the unscrambling control signals, the emitter sends encrypted authentication messages to which a correct response can be given only by the receivers where valid cards are used.