15. The computer program product of claim 11 , further comprising generating first barcode stamps which encode the processed data generated in step (b); wherein step (e) further includes printing the first barcode stamps on a front or back side of the same recording medium to generate the printed document.
15. The computer program product of claim 11 , further comprising generating first barcode stamps which encode the processed data generated in step (b); wherein step (e) further includes printing the first barcode stamps on a front or back side of the same recording medium to generate the printed document. 16. The computer program product of claim 15 , wherein the first barcode further encodes metadata relating to the printed document, and wherein in step (d) the hierarchical barcode stamp further encodes the metadata.