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I'm on Xubuntu 18.04.4 LTS. I received a document, then forwarded it to other people who should be able to modify it. However digital signatures might prevent that.

How do I check if Adobe was used to sign the document? (without Adobe reader)

EDIT: related questions:

Verifying digital signature on PDF

How can I validate a pdf's digital signature with evince?

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You can use masterpdf. The last (free) version can verify a signature. See also this answer.

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