as Phil already mentioned, please keep in mind that this only disables the download button. However, if the User wants to copy the information from those documents, they have many possibilites to do so. If a user is not allowed to copy a document, but print it, they can just print to PDF, print to a physical printer and scan it, or they could just screenshot the document.
So this setting does by no means prevent the user from redistributing the data, if that is what you want to achieve.
Greetings from Germany,
Simon H. Hellmann
DocuWare System Consultant