I wonder if it is possible to protect PDFs for readers not to allow them to print the file, to share the file and to open it on different computers. The readers are from different places, they do not have accounts in the same company's AD, etc, the best verification way would be a login/password. It should be as much transparent for users as possible - both Mac and PC, no buzz with certificates import.
Is it possible to implement anything from this list with Adobe DC or Adobe Document Cloud?
However, security only limits printing, text extraction. You can't stop a file from being copied and shared except by standing over people with a pointy stick. DRM can make the shared copy useless, but that's not part of Acrobat.