There are some key points to understanding documents configured for revisions and redacted images when signing them using the Digital Signatures module.
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If a document is configured for revisions, and the first document is signed, that signature will not carry over to any revisions made after it was signed.
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If a document is configured for redacted images, and not revisions, any changes made to the document after it was signed will fail verification.
See Verifying a Document for information on verifying if your signatures are valid.
See Signing an Invalid Document for information on signing any invalid documents that may exist.