diff --git a/phpBB/includes/captcha/captcha_plugin.php b/phpBB/includes/captcha/captcha_plugin.php
deleted file mode 100644
index 7c601caa93..0000000000
--- a/phpBB/includes/captcha/captcha_plugin.php
+++ /dev/null
@@ -1,99 +0,0 @@
-<?php
-
-interface phpbb_captcha_plugin
-{
-	/**
-	* Initiates the CAPTCHA to validate codes. 
-	* @param int $type the type as defined in constants.php
-	*/
-	function init($type);
-
-
-	/**
-	* Returns true if the captcha will work on the current install
-	*/
-	static function is_available();
-	
-	/**
-	* Returns the translated pretty name of the captcha.
-	*/
-	static function get_name();
-	
-	/**
-	* Returns the class name of the captcha.
-	*/
-	static function get_class_name();
-	
-	/**
-	* Returns an instance; does not have to be the same instance twice.
-	*/
-	static function get_instance();
-
-	/**
-	* Returns the HTML needed to embed the captcha in another template
-	*/
-	function get_template();
-	
-	
-	/**
-	* Delivers the image of image based captchas; not required for text/remote etc CAPTCHAs
-	*/
-	function execute();
-	
-	/**
-	* Returns the HTML needed to display a demo of the captcha
-	*/
-	function get_demo_template($id);
-	
-	
-	/**
-	* Delivers the demo image of image based captchas; not required for text/remote etc CAPTCHAs
-	*/
-	function execute_demo();
-	
-	/**
-	* Clears leftover entries in the database. 
-	*/
-	static function garbage_collect($type);
-	
-	
-	/**
-	* Clears all entries from the database if the CAPTCHA is replaced
-	*/
-	function uninstall();
-	
-	/**
-	* Sets up the CAPTCHA when it is selected in the ACP.
-	*/
-	function install();
-	
-	
-	/**
-	* Checks the captcha; returns false if the code was correct; a translated error string otherwise
-	*/
-	function validate();
-	
-	/**
-	* Prepares the captcha to ask a new question; required call on failed answers
-	*/
-	function reset();
-	
-	/**
-	* Displays the configuration options in the ACP
-	*/
-	function acp_page($id, &$module);
-		
-	/**
-	* Returns the entries for the hidden field array needed to preserve the current state.
-	*/
-	function get_hidden_fields();
-	
-	
-	/**
-	* Returns the number of solving attempts of the current user 
-	*/
-	function get_attempt_count();
-
-}
-
-?>
\ No newline at end of file