This CAPTCHA Plugin is an image verification plugin for use with Gossamer-Threads Links SQL. It's purpose is to help prevent robot-submitted forms. Features include: A unique encryption key per site, Optional verification for registered users, Admin specified list of allowed characters and CAPTCHA length. CAPTCHA verification can be enabled or disabled on a per-form basis.

This plugin is used in conjunction with our Contact Form and/or Guestbook plugins. It can also be used with on the default forms for: User Signup, Add Link, Modify Link, Add Review and Rate Link.

REQUIRES Gossamer Links 3.2 or higher and your server must pass certain requirements or it will not work. Please download the CAPTCHA Server Test script (from Download tab) and run it on your server to determine if this plugin will work on your system.

Requirements
Gossamer Links	Version 3.x
Web Server	Apache or Microsoft IIS with the ability to run CGI scripts.
Database Server	MySQL, Microsoft SQL Server, PostgreSQL, or Oracle database server.
System Requirements
Operating System	Microsoft Windows and most UNIX variants (Linux, FreeBSD, Solaris, Mac OS X, etc)
Perl	Perl 5.004_04 or better. mod_perl (optional)
Perl Modules	DBI and the appropriate DBD module for your database (eg. DBD::mysql).<br> Net::SSLeay (only required by the Authorize.Net and PayPal payment modules).

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File Name	Version	Added	Downloaded	Size	Download
CAPTCHA Plugin	1.1.2	08/03/2011	530	56KB
CAPTCHA Server Test		02/28/2017	475	3.14KB
Download and run the "CAPTCHA Server Test" script first to ensure you can use the Plugin.