In response to a request from a content server to forward an encrypted document to a recipient user, a forwarding engine in the content server prepares an e-mail message that contains a link to the document publisher and an identifier for the document. Upon receiving the e-mail, the recipient user can...http://www.google.fr/patents/US7373330?utm_source=gb-gplus-shareBrevet US7373330 - Method and apparatus for tracking and controlling e-mail forwarding of encrypted documents
Method and apparatus for tracking and controlling e-mail forwarding of ...
