I have an application developped with scriptcase, it’s used to peroform quality audits on field but in order to have it legallized we should create the pdf and sign it digitally (with digitall certificate), it’s possible to do that from scriptcase
Here (in NL) we have companies that digitally sign documents. They supply an API you need to talk to, i.e. using Curl. That is supported by PHP, so also by SC. However, I’m not aware of a library who can do this, but if there is, it would require to obtain a SSL certificate etc. But again, you need to write PHP. It is not a functionality of SC.