Unforunately, being able to read the document is already sufficient access to make your own copy and alter it however you please. The best you can do is a digi

Unforunately, being able to read the document is already sufficient access to make your own copy and alter it however you please. The best you can do is a digital signature[1], which proves that the document has not been tampered with. Of course, it's up to the recipient to ask for a signed document and to actually check if the signature is still present and accurate upon receipt. Otherwise, it's very trivial for a third-party to remove the signature and add their own edits. [1]: https://support.microsoft.com/en-us/topic/add-or-remove-a-digital-signature-in-office-files-70d26dc9-be10-46f1-8efa-719c8b3f1a2d https://support.microsoft.com/en-us/topic/add-or-remove-a-di...