On Sun, 31 Oct 2021, Hans Hagen via ntg-context wrote:
> in that case you probably need to hide more .. (when you process with
> \nopdfcompression at the top you can look in the pdf, i.e. compression
> is not encryption
>
> one thing you can do is make a copy of lpdf-xmp.lmt and wipe all tricky
> values and then use that to make a format
>
> but if security is important, maybe better is to use "qpdf" to encrypt
> the file (you can then also prevent editing for instance)
qpdf is also good at stripping metadata:
qpdf --empty --pages input.pdf -- output.pdf
Aditya
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