Htaccess help!

Hi all

I have a dynamic site and clean URLS are generated by an htaccess rule:

	RewriteBase /
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME} !-d
	RewriteRule ^(.*)$ /index.php?slug=$1 [L]

Code (markup):

Although this does work and creates something like /about/ from /index.php?slug=about, unfortunately the source link of /index.php?slug=about can still be accessed directly meaning there is a potential duplicate content issue.

Is there any rule I can create that makes sure this dynamic URL is redirected and cannot be accessed?

 

first line shoule be need

RewriteEngine On

after that add another line. it will work