One of the easiest ways to pirate information is using copy and paste to highlight content or create screenshot images for use in other applications. While some technology can disable highlighting, prevent right-click or to disable use of the printscreen key in Windows, it usually relies on JavaScript which is easy to modify or circumvent.
The Adobe Acrobat copy paste protection is completely useless since it can be removed without the user having to enter a password. To effectively disable copy paste in PDF documents you need to use a PDF DRM system that does not enable copying and also stops screen grabbing.
Infographic Source: https://www.locklizard.com/disable-copy-paste/