Generell problem with document sharing

Often it is necessary to edit secret documents with people. If some of these people get an invitation to share documents an theses people are not registered in zoho, they will get rihgts to read the file.

This is not good! Because ist is possible to read (and copy & paste) the document for everyone, who use the link without signing in.

I think it is much better, to allow even reading only for registered people!

Thanks a lot for answers!