Patents by Inventor Klaas BALS

Klaas BALS 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).

  • Publication number: 20120023335
    Abstract: According to the invention, a digital document is protected through: receiving (11) the digital document; receiving (12) associated data comprising at least partially data from the digital document; creating (13) a hash of the associated data; asymmetrically encrypting (14-15) the hash with a private key to generate a digital signature; encoding (16) in a machine-readable code the digital signature and the associated data; and recording (17) the machine-readable code onto a resulting hardcopy. The authenticity of a printed hardcopy of the digital document can be verified through comparison (31) of data extracted from the printed hardcopy (21) with the associated data decoded (23) and verified (24-30) from the machine-readable code.
    Type: Application
    Filed: September 29, 2011
    Publication date: January 26, 2012
    Inventors: Klaas BALS, Guy DEHOND, Nick HOFSTEDE