Hi, Authen::Captcha has not been updated for years and it has a fixed interface. GD::SecurityImage::AC tries to match that fixed functionality with extra GD::SecurityImage features. There are some CAVEATs mentioned in the GD::SecurityImage::AC documentation, other than that it's fully compatible and can replace Authen::Captcha. Afterall, it was written to replace Authen::Captcha. I no longer maintain GD::SecurityImage::AC but the current maintainer implemented some security features in it as I recall. GD::SecurityImage::AC does not replace GD::SecurityImage. GD::SecurityImage is an image generator and GD::SecurityImage::AC is a CAPTCHA handler. You can say that GD::SecurityImage::AC is a front-end to GD::SecurityImage. As for the release date issue; If there will not be some security issues or major bugs, I don't expect any updates to GD::SecurityImage::AC. It fulfilled it's purpose.