The Accessible Platform Architectures Working Group has published a Working Draft of a revision to Inaccessibility of CAPTCHA. Since the last publication, the abilities of robots to defeat CAPTCHAs has increased, and new technologies to authenticate human users have come available. This update brings the document up to date with these new realities. For more information, see the blog post Updated and extensively revised “Inaccessibility of CAPTCHA” Published. Read about the Accessible Platform Architectures Working Group and the Web Accessibility Initiative (WAI).