Security Variant vs. Advertising Variant
Basically we offer two versions of CaptchaAd.
The security variant is to be understood primarily as a replacement for CAPTCHAs, while the advertising variant is to be understood as an innovative, interactive form of advertising.
Further information can be found here at:
Comparison of Options
Security vs. Advertising Variant »
Updated: 09 November 2011, PDF-Format, 532KByte