Deploying Lync Server 2013 Persistent Chat Server.Recomposing virtual desktops in a VMware View 5.x.Unable to remove Signature from a digitally signed.Hope this helps anyone out there who may come across this You don’t need to save the document at this point so you can just close it.Īs easy as the process seems, it took me a bit of time to figure this out. The signature has been removed and the document has been saved. … and because you saved the original Excel spreadsheet to a new file, the signature should now successfully remove: Do you want to continue?Ĭlick on the arrow pointing downwards under the Invalid signatures window and select Remove Signature: Saving a copy of this workbook will invalidate all of the signatures in the copy. I usually don’t blog about Microsoft Office applications because I’m not at all savvy with Excel or the other applications in the suite but as I had to assist with signing various Excel documents today for a client and ran into this problem and only finding 3 posts via Google with no resolution, I thought it would be a good idea to blog the resolution.Īfter spending half an hour or so going through the Excel help files and navigating around the menus to find a button that switched to editing mode, the way I finally got around this error message to remove the signed certificate was to open the spreadsheet, click on the top left corner button then select Save As –> Excel Workbook:Ĭontinue selecting Yes to the following message: You’ve verified that enabling macros does not change this behavior: To add or remove signatures, enable editing, save your changes, and then try again. Signatures cannot be added or removed because this read-only workbook has been changed. You attempt to remove the signature clicking on the arrow pointing downwards then selecting Remove Signature:Īre you sure you want to permanently remove this signature? This action cannot be undone. This document contains invalid signatures. If you sign macros without a time stamp, the signature remains valid during the validity period of your certificate.You’ve made an attempt to sign an Excel 2007 spreadsheet with a certificate but noticed that you receive the following warning note when you reopen the spreadsheet: When you digitally sign macros, it is important to obtain a time stamp so that other users can verify your signature if the certificate used for the signature has expired, or has been revoked after signing.
Digital signature excel for mac 2016 code#
If you create an add-in that adds code to a macro project, your code should determine if the project is digitally signed and should notify the users of the consequences of changing a signed project before they continue. Corporate administrators can re-sign templates and add-ins so that they can control what users run on their computers. Therefore, locking your macro project doesn't prevent another user from replacing the digital signature with another signature. Your digital signature does not prove that you wrote the project. Your digital signature implies that you guarantee the project has not been tampered with since you signed it. If you want to prevent users of your solution from accidentally changing your macro project and invalidating your signature, lock the macro project before you sign it. However, if you have the valid digital certificate that was previously used to sign the project on your computer, the macro project is automatically re-signed when you save it. It is recommended that you sign macros only after your solution has been tested and ready for distribution: when code in a signed macro project is changed in any way, its digital signature is removed.
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