We have a document which contains, checkbox (OLE), text form fields and drop down lists. The document is protected and allows form filling only. The behavior of MS Word is very inconsistent and sometimes the digital signature is removed on save. MS Word displays a prompt saying that the signature has been tampered and it will be removed, but nothing has been done to the document that would force the signature to be removed. This was reported before and a patch was provided for older version of MS Word. We have already applied the latest MS Word 2003 SP3 patch.