13. The method of claim 1 further comprising: identifying a second original IVC; identifying a portion of the image format document represented by the second original IVC; generating a second verification data sequence from the identified portion of the image format document; generating a second modified verification data sequence from the second verification data sequence in accordance with the modification rules, wherein at least one element of the second verification data sequence, between the first and final elements of the second verification data sequence, is modified in the second modified verification data sequence; generating a second verification IVC, wherein generating a second verification IVC comprises performing a one-way operation on the second modified verification data sequence; comparing the second verification IVC with the second original IVC; and reporting an indication of tampering to the printed document, responsive to the comparison of the second verification IVC with the second original IVC.
13. The method of claim 1 further comprising: identifying a second original IVC; identifying a portion of the image format document represented by the second original IVC; generating a second verification data sequence from the identified portion of the image format document; generating a second modified verification data sequence from the second verification data sequence in accordance with the modification rules, wherein at least one element of the second verification data sequence, between the first and final elements of the second verification data sequence, is modified in the second modified verification data sequence; generating a second verification IVC, wherein generating a second verification IVC comprises performing a one-way operation on the second modified verification data sequence; comparing the second verification IVC with the second original IVC; and reporting an indication of tampering to the printed document, responsive to the comparison of the second verification IVC with the second original IVC. 14. The method of claim 13 wherein the second verification data sequence is a subset of the first verification data sequence.