Like locker

Hi guys,
does anybody of you know the name of the following "like-lock" script?
If you click the "download" (in this case: enter competition) = survey button it says you have to complete step 1 to download the file. And when you like this page the step 1 gets completed.

Site: http://www.getdota2beta.com/ (This site is not mine just want to show you the script)

Thanks!

I also need some thing like this
is any one here can help about this

No idea about that particular script but lots of like lockers available at codecanyon, standalone and wordpress. Lightbox effect or just for hiding a part of a post in wordpress. Could do something similar with those?