Kamikaze,
 
I am a current Subscriber with Groove3.com, which means that I buy videos, have an open account for viewing the videos I've purchased and credit rewards with them for free or reduced purchases. 
 
When I went to the site and saw the message for the free 72 hours I click the get started button and then logged in as normal and was offered the free 72 hours for viewing any video I wanted.