I need to implement secure content delivery in Tridion 2013 for providing the security to the content based on the roles, but I gone through the document on SDLTridionWorld (https://www.sdltridionworld.com/articles/securecontentdeliveryoverviewfaq.aspx) site and get to know that The Secure Content Delivery module is only available for the following Tridion Releases:
Tridion R5.1 SP2 Tridion R5.1 SP3 Tridion R5.1 SP4
So if that is the case then how i can do implementation in Tridion 2013 version.