avoid unwanted access to their sites web is very important. The best system of protection of access is currently Captcha, which is the plugin that allows you to restrict access in login, contact us, registration, password reset and remind user name.
Unfortunately, the use of this plugin, in many cases is restricted to web professionals, so many novice users are not able to use it.
OSOLCaptcha , however, was also created for users less "navigator", in fact, in three simple steps you can add the plugin to your Joomla template.
After installing the plugin, simply publish it and choose from five types of models described earlier.
Although it is not mandatory in many cases, it is recommended to go to the admin panel of the plugin and perform two additional actions to ensure a protection against spam attacks. They are explained in an excellent manner, the page from which you can download the plugin.
There are also limitations related to ease of use, but consult the OSOLCaptcha, you will find a way to use it without major problems.
http://extensions.joomla.org/extensions/access-a-security/site-security/captcha/11521
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