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Remove This Captcha Plugin Now! | WP Decoder
I've recommended BestWebSoft Captcha in the past and now regret it after reading this article: Looks like BestWebSoft sold the plugin and you need to remove this plugin right away and update all your plugins. I do recommend that you have some kind of captcha on your login page for security and use at least the free version of the WordFence plugin. I use Google Captcha (reCAPTCHA) by BestWebSoft Stay safe, my friends!