From their FAQ: http://www.webtoolmaster.com/helpcopyprotection.htm
Q. Which files can be protected with WTM CD Protector? Which ones cannot?
Filetype appendix protectable
Executable file .exe, .com Only if no CRC-Check
Archived, packed file .zip, .rar, .ace, .tar, .jar, … Negative
Media-file (movie/musik) .mpg, .avi, .mp3, … Normally negative (try it)
documents .html, .php, .doc, .xls, .txt Negative
images, pictures .jpg, .bmp, .gif, .jpeg, … Negative
If your DVD has files that are not executables they will not be protected. I wish I had a solution to this as I sell homemade data DVDs with everything but executables on them that I produce myself and I know there is rampant copying of them. Sucks when you spend thousands of hours on a product that people routinely steal from you.