Complex document security

Details Complex document security Complex document security

G - Physics

06

F

G06F 12/14 (2006.01) H04L 12/58 (2006.01) H04L 29/06 (2006.01) H04N 1/44 (2006.01)

Patent

CA 2151739

A method and means are provided to control the degree to which the presence of covert information may be reduced, eliminated or corrupted in documents created on a computer device (particularly complex documents) (10) before the document is transmitted outside a secure environment (20) in which the document is created. A preferred step in the process of handling a document in a secure environment comprises the step of displaying (34) the document or a predetermined portion thereof in a manner which conforms to the rule that no pixel of the display is written to more than once for the current portion of the document being displayed. Preferably the steps of creating a document (10), transforming (16) said document into an intermediate form (18) by defining the content and structure of said document using a predetermined set of document describers, applying the intermediate form (18) of said document to at least one filter (22) adapted to eliminate or corrupt the content and form of any covert information contained within the intermediate form (18) of said document (10) followed by the previously described step of displaying (34) the document in the manner described above.

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