Describes the cause and action for error messages.
Error Message(English)：
invalid signature excel 2010
The "Invalid signature" indication appears when you try to open a ...
https://support.microsoft.com/en-us/help/967732/the-invalid-signature-indication-appears-when-you-tr・・・
Warning "This document contains invalid signatures" when opening ...
https://support.docusign.com/en/articles/Warning-This-document-contains-invalid-signatures-when-open・・・
How to tell if a digital signature is trustworthy - Office Support
https://support.office.com/en-ie/article/how-to-tell-if-a-digital-signature-is-trustworthy-61a46050-・・・
Digital-signature and ...
https://support.office.com/en-ie/article/how-to-tell-if-a-digital-signature-is-trustworthy-61a46050-・・・
How to tell if a digital ...
https://support.office.com/en-ie/article/how-to-tell-if-a-digital-signature-is-trustworthy-61a46050-・・・
Recoverable-error digital ...
https://support.office.com/en-ie/article/how-to-tell-if-a-digital-signature-is-trustworthy-61a46050-・・・
microsoft excel - This digital signature is invalid and cannot be ...
https://superuser.com/questions/1331780/this-digital-signature-is-invalid-and-cannot-be-trusted-the-・・・
[QODBC-ALL] Troubleshooting - [Fixed] Microsoft Excel/Access 365 ...
https://support.flexquarters.com/esupport/index.php?/Knowledgebase/Article/View/2944
How to add a digital signature in Microsoft Excel 2013 - YouTube
https://www.youtube.com/watch?v=NpKEGsldG1A