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During the certificate signing process, you can (should) "review document content that may affect signing." This is the process I'm referring to:
Tools > Forms & Signatures > Certificates > Certify (Visible Signature) > designate the location for your digital ID certificate signature (use the cursor to draw a rectangle where you want your digital signature to appear) > Sign Document > Sign with a Digital ID > Choose the Digital ID that you want to use for signing (click radio button) > Continue > Review document content that may affect signing > Review.
(Suggestion for Adobe: Explain what "content that may affect signing" means with a footnote or similar.)
If your document does not contain any problematic content, you will see (after clicking on the Review button) "Document warnings have been reviewed."
(Suggestion for Adobe: This message is not obvious [grey font on grey background], plus its meaning is not clear. I suggest changing it to produce a message in a different color font that says something like, "Your document does not contain any content that might affect signing, also known as signature report errors.")
On the other hand, after clicking the Review button, you might see an Appearance Integrity Report. This is the one I was getting:
After reading conflicting advice, I was not sure if I should try to remove the items that were compromising the integrity of the certification process. But a very helpful community member helped me understand that I should try to remove the cause of such error codes.
Here are the fixes I discovered for error codes 1002 & 1008. There might be other fixes. But these worked for me, i.e., when I clicked "Review" during the certificate signing process, I did not receive any errors. (I'm on Windows 11 Pro with Adobe Acrobat Pro, version 2023.006.20360, 64-bit.)
Report code 1002. String: Comment or form field may silently change. Description: The document contains comments. Comments' visual appearances may change based on external variables.
Fix for code 1002: Edit > Preferences > Reviewing > Uncheck all the boxes > Click OK.
Report code 1008. String: Document contains hidden behavior. Description: The document contains hidden actions that may not be intended or knnown by the end user. Actions include JavaScript actions (document open, save, etc.), playing multimedia, executing a menu item, and so on.
Fix for code 1008: Edit > Preferences > JavaScript > Uncheck "Enable Acrobat JavaScript" > Click OK.
For a list of all the signature report error codes with Descriptions—which help you to understand what needs fixing—see this Adobe developer's document:
Digital Signatures Workflow Guide for the Adobe® Acrobat Family of Products (rev. 28 Sep 2012), https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigSig_WorkflowGuide.pdf
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I realized I could make it easier for you and post the table from page 62 of that Digital Signatures Workflow Guide:
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+1 for the Suggestions for Adobe - currently one really gets the impression that these appearance warnings have been added to the UI in a manner to not disturb the common user. The main objective seems to be to allow Adobe to point to these warnings after some issue come up with a document that changed its appearance in an unexpected manner after signing.