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How to use apache pdfbox to check PDF contains watermark and watermark content allows at least 6.35mm of non-printable area on each edge of a page?

I need to support various printer margin capabilities; it is STRONGLY RECOMMENDED that the watermark content allow for at least ¼” (6.35mm) of non-printable area on each edge of a page.

I want to achieve this using apache pdfbox but, not getting how to proceed.

I want to check if watermark exists in the PDF, then the watermark content allows for at least ¼” (6.35mm) of non-printable area on each edge of a page.

f_puras
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Messy Rider
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    It may be difficult to recognize watermarks. It should be doable, though, to check whether there is _any_ content at all near to the edges. – mkl Mar 01 '23 at 11:39
  • Can be use apache pdfbox to find any embedded thumbnails within the PDF? – Messy Rider Mar 02 '23 at 09:45
  • *"Can be use apache pdfbox to find any embedded thumbnails within the PDF?"* - see [Tilman's answer](https://stackoverflow.com/a/75614786/1729265) – mkl Mar 02 '23 at 15:41

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