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:
Jul. 28, 2009
Filed:
Nov. 22, 2000
Hiroji Saito, Tokyo, JP;
Tatsuji Nagaoka, Sapporo, JP;
Tomoko Matsuura, Tokyo, JP;
Mariko Wakaizumi, Tokyo, JP;
Hiroji Saito, Tokyo, JP;
Tatsuji Nagaoka, Sapporo, JP;
Tomoko Matsuura, Tokyo, JP;
Mariko Wakaizumi, Tokyo, JP;
NTT Advanced Technology Corporation, Tokyo, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A user sends a request signal to a delivery management serverby utilizing a mobile stationin response to a broadcast service provided by a broadcast station. The request signal includes a music song ID of music song data segments which the user wants to be delivered and also an address of the destination to which the music song data segments be delivered. Upon the receipt of the request signal, the delivery management serverreturns, in the case of unpopular songs, the music song data segments and a decrypting key for decrypting the data segments, and on the other hand, it returns, in the case of popular songs, only the decrypting key to the mobile stationor a STB. The mobile stationor the STBdecodes, in the case of unpopular songs, the music song data segments received from the delivery management serverby utilizing the decrypting key therefor and on the other hand, it receives, in the case of popular songs, the music song data segments in the broadcast waves provided from the broadcast stationand then decrypts data segments by utilizing the decrypting key received from the delivery management server