Is there any commercial Digital Signature?

Excel Facts

Round to nearest half hour?
Use =MROUND(A2,"0:30") to round to nearest half hour. Use =CEILING(A2,"0:30") to round to next half hour.
You can check the list found by opening Internet Explorer, going to Tools > Internet Options > Content > Certificates > Trusted Root Certification for a list of the default trusted Certificate Authorities.

Interestingly, you can use SelfCert.exe to create a certificate, and then add that certificate to the Trusted Root Authorities, to suppress excel warnings.
 
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