Content protection from copy-and-paste
You can apply password-protection to your PDF that stops someone from highlighting its text or images and copying it to their computer’s clipboard. We found this security scheme worked when viewing PDFs in not only Adobe Reader but also third-party PDF viewers like Foxit Reader. You can’t even load such a protected PDF into Acrobat XI itself to edit it -- only to view it. However, this doesn’t prevent someone from using a screenshot program to snap an image of a page.