There is huge money in plagiarism detection, and study after study coming from well funded universities (often times with the funding coming from Google) has shown that Copyscape's algorithm is by far the most effective one.Do you guys really think a multi-billion dollar company like Google uses a simple algorithm like CopyScape's? I mean, come on! You can beat CopyScpae by just changing every 3rd word! Really? Google is that stupid?!? They couldn't think of a better way to check dupe content with their billion dollar funds and top minds in the business?