1. This document have digital signature. <br />To ensure the integrity of document, you can consider adding a digital signature to Word documents. The digital signature will be invisible and will not allow to edit the document making it locked. The locked document can be unlocked, but doing this will make the digital signature invalid. So this process ensures that your document is not tampered with.<br />If any edits are made to the document, then the signature will become invalid.<br />