Hewlett-packard Development Company, L.p.

Darpan Goel

Anil Kv Kumar

Srinivasan Ramani

Anjaneyulu Seetha Rama Kuchibhotla

Srinivasu Godavari

A physical document comprising a human-readable part and a machine-readable part, wherein the machine-readable part comprises markup that describes information on at least one of the document and data within the human-readable part.

Document and method of producing a document

A method for preparing and verifying a document, comprising the steps of: presenting the document to a document-registering office in a machine-readable format; editing the document to add an identification code associated with a non-copiable object; signing the edited document using a private key of the document-registering office; printing the digitally signed document in a machine-readable form; presenting the document and the object to an inspecting authority; recovering the digitally signed document from the machine-readable form of the printed document; verifying the digital signature of the document-registering office; and verifying that the identification code in the document corresponds to that of the presented object.

Method and apparatus for preparing and verifying documents

A method of independently encoding an image with two information channels comprises generating an image which encodes a primary information channel based on brightness levels. The image is modified to encode a secondary information channel. This image modification comprises applying one of two image output values to the image portion, wherein the brightness of a modified image portion is not changed such as to change the primary information channel encoding.

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Karnataka, India

Darpan Goel