The university where I'm studying for my MS uses such a system and, interestingly, has it integrated into their course management system such that I can actuall

The university where I'm studying for my MS uses such a system and, interestingly, has it integrated into their course management system such that I can actually see the reports on my own assignments. I've noticed that on a number of lengthy papers I've turned in it marks nothing at all, which is conspicuous considering that I tend to quote from other literature very heavily. I'm not sure if the plagiarism service is just not very effective or if the fact that I turn in mostly LaTeX-generated PDFs is causing a problem with their text extraction. I actually suspect the latter, because a couple of times I've turned in MS Word files it's marked one or two random phrases as suspect.