Method and system for digital rights management and digital signatures
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United States of America Patent
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N/A
Issued Date -
Nov 20, 2003
app pub date -
May 6, 2003
filing date -
May 6, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and systems for digital rights management are disclosed. Exemplary embodiments of the invention provide a system and method that allows the author of a design file to encrypt the file's contents, so that only authorized users can view the file, and that allows the author to identify specific users for authorization. The author selects the users that are allowed to open the encrypted file. Selected users are called 'recipients'. The author then designates the rights granted to the recipients. Preferably, the author identifies users and users are authenticated by means of the user's digital certificates. The author may also have the ability to specify what operations a given user can perform, including view, print/plot, export, copy to clipboard, access history, and edit. An author can also digitally sign a document or file using their digital certificate. A hash value is created for the item to be signed. The hash value is encrypted using a private key specified by the digital certificate and secured to the item. The hash value is verified by a recipient to determine if the item was modified.
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