I try and avoid using Captchas because of the accessibility problems it introduces (accessibility is one of my professional skills, whereas photography is a personal hobby for me). However, accessibility is an interesting point that could be covered in PhotoLegal. Does a photography website need to be accessible to blind users who, after all, will never be able to use it on an equal basis as sighted users. I don’t think the Disability Discrimination Act provides for this sort of exception, but would be interested in view of the PhotoLegal team.