It really doesn't look to me like megaupload worked too hard on their captcha. In the general case, this is apparently a difficult problem because of the chara

It really doesn't look to me like megaupload worked too hard on their captcha. In the general case, this is apparently a difficult problem because of the character segmentation step. So, my guess is that if megaupload did something to decrease the distinction between characters (script letters, for example), the feasibility of a javascript implementation would break down.