How can I sign documents digitally (using a certificate)
On the windows platform, there is a lot available to digitally sign documents (using password protected certificates that have the same value as a real signature).
What alternatives are there on the Mac platform to sign office documents, spreadsheets, pdf's etc...?
Don't tell me the preview annotate add signature feature ( = useless) ... that has nothing to do with a legal signature as the document can be modified without the signature becoming invalid.
MS office for Mac does not seem to support creating or testing the signatures created on windows.