So.. I've read a bunch of times on here that the images youtube uses in its CAPTCHA repeats a lot.. so I thought hey why not I'll see what I can do. I opened delphi and created a simple program that populates a folder with any amount of youtube's CAPTCHA images (i did 10,000) then it grabs a new CAPTCHA (say you were creating an account) then it compares a small section of that image(20 pixels in the middle) against the 10,000 pre-downloaded images. Let me tell you, not one has matched so far. Any ideas? Kind of disappointing put some time into this.. ;/ EDIT: I lied, I tried that with only 2000 I just moved it up to 8,000 and it finally just solved one! OMG success! Takes about a second for each thousand images.