How do I register eDrwings "free" viewer

I just downloaded eDrawings to evaluate it for use in our company for non CAD people. We use AutoCAD 2011.

I had no problem downloading and installing the application, but I can't figure out where I get the license key / activation code etc.

I can use the 15 day "Free Trail" code. But I thought this was a free application. I can't find anything on the SolidWorks web site about BUYING the application.

I'm obviously a newbie to SW. Can somebody help?

SolidworksAdministration