Captcha Service
Web service that allows users to create CAPTCHA-like ("Completely Automated Public Turing test to Tell Computers and Humans Apart") images and validate the response entered. Current version is v1.0.0.The following operations are supported. For a formal definition, please review the Service Description. AbandonImageWord - Abandons a specific image as specified by the GUID. This should be used when you can control the cancellation and avoid leaving hanging images. GetNewWord - Get the GUID of a specific image. Images can only be retrieved one time from the URL specified in the returned CaptchaImageWordModel. ValidateImageWord - Get the GUID of a specific image. Words can only be validated one time; in the case of a failure, a new Image GUID must be generated.
More information: http://www.textdisguise.com/TextDisguise/CaptchaService/CaptchaService.asmx