This control serves as spam protection mechanism. It impplements 3 strategies: 1. Auto-detection - if this strategy is chosen, then we use predefined rules which decide whether the input comes from a robot or not. This strategy is not 100% secure and some sophisticated robots may pass it so it should be used in personal websites with low traffic and where spam robots are not very likely to drop by. If such robots are found to visit the site, the use of the more secure strategy is more advisable. 2. KaxCaptcha - if this strategy is chosen, then an image with obfuscated text is displayed and the user is required to input this text in a textbox thus allowing the control to validate whether s/he is a robot or not. This is the most secure method to protect from spam but it is considered to be inaccessible because disabled people may not see the text in the image! TODO in future release: 3. Subscribe to anti-spam services. This last spam protection mechanism is used to validate the input against public or private web services which given the input return whether or not it is considered to be spam. Some services claim that they catch more than 90% of the spam so this type of protection is fairly secure and can be used in small to medium websites but not in large-scale websites.

public class KaxCaptcha : KaxWebControl, IValidator, 
	INamingContainer, IPostBackDataHandler

Public Class KaxCaptcha
	Inherits KaxWebControl
	Implements IValidator, INamingContainer, IPostBackDataHandler

public ref class KaxCaptcha : public KaxWebControl, 
	IValidator, INamingContainer, IPostBackDataHandler

type KaxCaptcha =  
    class
        inherit KaxWebControl
        interface IValidator
        interface INamingContainer
        interface IPostBackDataHandler
    end