http://jcaptcha.sourceforge.net/ JCaptcha - Last Published: 01 Sep 2012 | Version: 2.0-alpha-1-SNAPSHOT jcaptcha.sourceforge.net https://developers.naver.com/docs/utils/captcha/ 캡차 API 개발가이드 NAVER Developers - 캡차 API 개발가이드 developers.naver.com http://simplecaptcha.sourceforge.net/ SimpleCaptcha - A CAPTCHA framework for Java SimpleCaptcha is a Java library for generating CAPTCHA challenge/answer..