Patents by Inventor Stefan Podhajski

Stefan Podhajski 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).

  • Optical disc copy prevention system
    Patent number: 6987718
    Abstract: Software is securely distributed with limited usage rights. The software may be an executable program and/or one or more data files such as image or multimedia data files. The software includes an access control object which prevents at least some usage of the software without use of a first access control code. The first access control code is produced based on selected information characteristic of the user's computer system. The access control code is produced in a server computer to which the user directs a request for the access control code. The user makes a payment to receive the access control code, which is then downloaded to the user's computer system.
    Type: Grant
    Filed: March 8, 2001
    Date of Patent: January 17, 2006
    Assignee: Sony DADC Austria AG
    Inventors: Andreas Winter, Stefan Podhajski
  • Optical disc copy prevention system
    Publication number: 20020186629
    Abstract: Software is securely distributed with limited usage rights. The software may be an executable program and/or one or more data files such as image or multimedia data files. The software includes an access control object which prevents at least some usage of the software without use of a first access control code. The first access control code is produced based on selected information characteristic of the user's computer system. The access control code is produced in a server computer to which the user directs a request for the access control code. The user makes a payment to receive the access control code, which is then downloaded to the user's computer system.
    Type: Application
    Filed: December 5, 2001
    Publication date: December 12, 2002
    Inventors: Andreas Winter, Stefan Podhajski