perhaps you could also lock down the picture capability too by interfering with interlacing and/or refresh rates somehow.
Interlacing? Refresh rates? This is 2015, those things don't apply any more: everyone has LCD now. Software has no real control over the display.
We have some standards documents which must be purchased. In order to prevent copyright theft, the distributor of the PDF files requires software on your computer which will actively disable the native clipboard and screenshot capabilities while the PDF is open. In addition, the software will look for common screenshot software like snagit and greenshot and force them to close before you can launch the PDF.
This sounds like malware to me.