| 摘要 |
Disclosed is a method (600) of protecting a document (715) containing document information content, the method comprising the steps of defining a regular grid (716) over the document (715), separating the grid intersection points into a repeating pattern of points (701-704), wherein each member of the repeating pattern comprises two subsets of points (705, 709) having a predefined spatial relationship, said subsets of points being associated with corresponding regions of the document (715), and modulating (506), with respect to each member of the repeating pattern (701-704), protection mark attributes of protection marks associated with one of said subsets of points (709), to thereby encode information about the document information content of the regions of the document associated with both said subsets of points (705, 709).
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