Normalize /LastModified - #6
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A producer stamps a wall-clock time into the /LastModified of a page or page-piece dictionary, so it changes on every render even when nothing about the document did. PDFTron writes one onto the form XObject it uses for a watermark: /PieceInfo<</PDFTRON<</LastModified(D:20260729134217Z)/Private/Watermark>>>> It is a plain PDF date string like /ModDate, so the existing length-preserving ZeroPdfString pass covers it.
This was referenced Jul 30, 2026
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A producer stamps a wall-clock time into the /LastModified of a page or page-piece dictionary, so it changes on every render even when nothing about the document did. PDFTron writes one onto the form XObject it uses for a watermark:
/PieceInfo<</PDFTRON<</LastModified(D:20260729134217Z)/Private/Watermark>>>>
It is a plain PDF date string like /ModDate, so the existing length-preserving ZeroPdfString pass covers it.