Patents by Inventor Yun-sang Oh

Yun-sang Oh 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).

  • Method and apparatus for digital rights management using certificate revocation list
    Publication number: 20050210241
    Abstract: A digital rights management method includes a stage for a device to update a Certificate Revocation List of the device through a connection to a portable storage, a stage to access to the updated Certificate Revocation List so as to judge the effectiveness of a certificate of the portable storage, and a stage to maintain communication with the portable storage, if the judgment proves the effectiveness of the portable storage.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 22, 2005
    Inventors: Byung-rae Lee, Tae-sung Kim, Kyung-im Jung, Yun-sang Oh, Shin-han Kim