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I'm using the pdfx package to generate PDF/A. I'm using as well the embedfile package to attach file to the PDF/A-3b.

Now my question is: Does PDF/A-3b requires PDF V1.7 or PDF V1.4?

\usepackage[a-3b,pdf17]{pdfx}

or

\usepackage[a-3b]{pdfx}
Wollmich
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    Wrong forum. That is unrelated to TeX. It is about PDF/A standards. Search the Internet for info. Whether you need 1.7 or can simply use 1.4 is a matter of document content. For arbitrary file attachment you probably need 1.7. –  Apr 12 '18 at 16:52

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