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I went through the instructions, but still getting the error. I am using Adobe DC 2015. The problem thats being address is "there was a problem with tthe signature" My error is "At least one signature is invaild". I agree it could be a certificate error. I don't know if it is a rights issue or Not. i have attached a copy of the error and the properties of the signature. If you need any more information, please let me know. Thank You!!
Hi,
I apologize I reused these slides from another support that I foored to another user; in any case you can still use the examples above to approach the issue following the following guidance from these thread: https://forums.adobe.com/thread/760362 and
more steps described in detail here: https://helpx.adobe.com/acrobat/using/validating-digital-signatures.html
If none of these works, would you believe it cold've been possible that the original filewas flattenned or refried, then they added signatures fields again?
I've seen this before, so my suggestion follow the steps in the last link and see tha part that explains how to compare the signed document with the original document. Details to pay attention in the screenshot that you provided, (1) you have a signature detected as invalid (2) "Reasson" document was exported (3) a paradox here however "The document has been altered or corrupted since the Signature was Applied." yet "The signer's identity is valid. (4) Revocation Checking is not performed for Certificates that you have directly trusted (maybe untrusting and re-trusting can validate).
The trick here is that you have to follow a sequence of steps for the actual validation to take place. If you miss the one step you will not see it fixed.
See in the slide below the areas you need to go through:
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