Problems with a signed PDF: Own signature is invalid

Question

Hi there,

I've got a problem with a signed PDF. The pdf was signed by four people. All signatures has been accepted by myself. In other PDFs each of the signature works well and is shown as a valid one.

In this specific PDF, the first two signatures are shown as "invalid" (not "unknown" as it is if I did not accepted the signatures yet) with the remark "The document has been altered or corrupted since the signature was applied". The last two signatures are regularly shown as valid.

I have absolutely no idea why the first signatures are invalid in this case. How can I find out what happened?

Thanks!

Eric Dumas · Accepted Answer

This type of message seems to indicate that the document was modified after the first 2 people signed it, they just need to reconfirm their approval. It doesn't always mean a user opened the file and tried to actually modified it. Sometimes, i noticed in a saving process the system flags this as a precaution more than catching an attempt to change the file.

lgp1985 · Answer

I'm facing the same issue, I'm just picking my certificate as part of digitally signing any PDF and I receive: The document has been altered or corrupted since the Signature was applied

What am I doing wrong?

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