Patents by Inventor Eiji Oga

Eiji Oga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Off-line content delivery system with layered encryption
    Patent number: 8600062
    Abstract: Systems and methods are described for over-encrypting symmetrically pre-encrypted content for off-line delivery to playback devices using portable media drives in accordance with embodiments of the invention. One embodiment of the method of the invention includes symmetrically pre-encrypting the content, receiving a request to issue content for playback on at least one playback device associated with a user account, where each playback device includes a processor containing a private key assigned to the playback device by a conditional access system, generating a content key and over-encrypting at least a portion of the symmetrically pre-encrypted content in response to the request, obtaining a public key for each playback device, encrypting a copy of the content key using the public key of each playback device associated with the user account, and delivering the over-encrypted content and the at least one encrypted copy of the content key to a playback device associated with the user account.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: December 3, 2013
    Assignee: Verimatrix, Inc.
    Inventors: Christopher Rae, Robert Kulakowski, Subrata Datta, Eiji Oga, Nicolas Pauli, Akinwale Olugbemiga Olugbile
  • OFF-LINE CONTENT DELIVERY SYSTEM WITH LAYERED ENCRYPTION
    Publication number: 20110069836
    Abstract: Systems and methods are described for over-encrypting symmetrically pre-encrypted content for off-line delivery to playback devices using portable media drives in accordance with embodiments of the invention. One embodiment of the method of the invention includes symmetrically pre-encrypting the content, receiving a request to issue content for playback on at least one playback device associated with a user account, where each playback device includes a processor containing a private key assigned to the playback device by a conditional access system, generating a content key and over-encrypting at least a portion of the symmetrically pre-encrypted content in response to the request, obtaining a public key for each playback device, encrypting a copy of the content key using the public key of each playback device associated with the user account, and delivering the over-encrypted content and the at least one encrypted copy of the content key to a playback device associated with the user account.
    Type: Application
    Filed: July 20, 2010
    Publication date: March 24, 2011
    Applicant: Verimatrix, Inc.
    Inventors: Christopher Rae, Robert Kulakowski, Subrata Datta, Eiji Oga, Nicolas Pauli, Akinwale Olugbemiga Olugbile
  • Method and apparatus for efficiently running an execution image using volatile and non-volatile memory
    Patent number: 6895463
    Abstract: The present invention provides an apparatus and method for efficiently running an execution image containing instructions for running a computer program in a set-top box. A non-volatile memory stores a compressed version of the execution image. A volatile memory is configured to execute the execution image. A computing unit transfers and decompresses the compressed version of the execution image from the non-volatile memory to the volatile memory where the execution image in non-compressed form can be executed efficiently.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: May 17, 2005
    Assignee: Pioneer Digital Technologies, Inc.
    Inventors: Eiji Oga, Kazuhiro Miyoshi, Park Uh
  • Method and apparatus for efficiently running an execution image using volatile and non-volatile memory
    Publication number: 20030093653
    Abstract: The present invention provides an apparatus and method for efficiently running an execution image containing instructions for running a computer program in a set-top box. A non-volatile memory stores a compressed version of the execution image. A volatile memory is configured to execute the execution image. A computing unit transfers and decompresses the compressed version of the execution image from the non-volatile memory to the volatile memory where the execution image in non-compressed form can be executed efficiently.
    Type: Application
    Filed: May 2, 2002
    Publication date: May 15, 2003
    Inventors: Eiji Oga, Kazuhiro Miyoshi, Park Uh