I'm currently programming an alternative software to things such as Writecheck, Turnitin and Viper for my students and I was wondering if there were any current exploits (i.e. scripting) or anything else that could potentially bypass the system. As I want to patch these in my updated programme - specifically for the submission of Word document files.

Just as a heads up I'm aware of methods that include inserting quotes, foreign letters/symbols, using images of text and merely paraphrasing (none of which work under most plagiarism checker algorithms anyway).