Patents by Inventor Zwart Sjoerd

Zwart Sjoerd 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).

  • User based content key encryption for a DRM system
    Patent number: 8875299
    Abstract: A digital rights management (DRM) system, device and method having an authorized domain (12) for managing digital media, wherein the authorized domain or entity such as a rights issuer utilizes user based content key encryption. In one aspect, the system includes plurality of interconnected devices (16) that comprise: a storage system for storing a user key (19) from a user belonging to the authorized domain; a system for downloading content (13) encrypted with a content key (32); a system for downloading a content key encrypted with the user key; a decryption system (28) for decrypting the encrypted content key with the user key; and a system (28) for decrypting the encrypted content with the decrypted content key.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: October 28, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Arno Van Loenen, Sebastiaan Antonius Fransiscus Arnoldus Van den Heuvel, Zwart Sjoerd
  • User Based Content Key Encryption For A Drm System
    Publication number: 20070220610
    Abstract: A digital rights management (DRM) system, device and method having an authorized domain (12) for managing digital media, wherein the authorized domain or entity such as a rights issuer utilizes user based content key encryption. In one aspect, the system includes plurality of interconnected devices (16) that comprise: a storage system for storing a user key (19) from a user belonging to the authorized domain; a system for downloading content (13) encrypted with a content key (32); a system for downloading a content key encrypted with the user key; a decryption system (28) for decrypting the encrypted content key with the user key; and a system (28) for decrypting the encrypted content with the decrypted content key.
    Type: Application
    Filed: October 6, 2005
    Publication date: September 20, 2007
    Applicant: Koninklijke Philips Electronics, N.V.
    Inventors: Arno Van Loenen, Sebastiaan Antonius Fransiscus van den Heuvel, Zwart Sjoerd