Patents by Inventor Mohan S. Kankanhalli

Mohan S. Kankanhalli 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).

  • Patent number: 5499298
    Abstract: The present invention is a method and apparatus for controlling the dissemination of digital information. Digital information is structured logically to incorporate usage history and allowable access window before it is encrypted in a header portion and a body portion. The end user accesses the digital information with a tamper-proof controlled information access device by decrypting the digital information. A controller disposed in the controlled information access device permits end users to access transparently uncontrolled information. Controlled digital information will be accessed as long as the conditions specified by the information provider are met. In one embodiment of the present invention, controlled information is disseminated in an off-line manner while the second embodiment of the present invention disseminates controlled digital information in an on-line manner.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: March 12, 1996
    Assignee: National University of Singapore
    Inventors: Arcot D. Narasimhalu, Weiguo Wang, Mohan S. Kankanhalli
  • Patent number: 5412718
    Abstract: The present invention is a method for preventing unauthorized copying and use of information which is stored on a storage medium and for restricting the use of such information to designated devices. Copy protection is achieved by generating a signature from a given storage medium. The signature is derived from an arbitrarily selected list of nonuniformities, uniformities and their attributes. The selected list may contain nonuniformities at any granularity level. As such, this signature is unique to a given storage medium in the same way finger prints are unique to a human being. This signature is used to derive a key for encrypting the information on the storage medium. Any copying of the distribution information from one storage medium to another results in the mutation of the signature required to decrypt the information. Therefore, the present invention obviates the need for introducing artificial indica or requiring a special hardware subsystem for achieving a copy protection scheme.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: May 2, 1995
    Assignee: Institute of Systems Science
    Inventors: Arcot D. Narasimhalu, Weiguo Wang, Mohan S. Kankanhalli