Recurring $20/mo to download unlimited video backgrounds

So, after reading the .pdf, I see that I can [[protect]] a post. But wait, I need to sell memberships for people to download video files. So, although I'm protecting
mysite.com/insanely-awesome-post
what I need to make sure I'm protecting is actually the video files themselves....
Hopefully this'll make sense:
/uploads/2014/08/backgroundloop1.mp4
/uploads/2014/08/backgroundloop2.mp4
/uploads/2014/08/backgroundloop3.mp4

Does this protect that? Shouldn't there be some type of file encryption or something like that?

...reading more over on MarketPlace....my head hurts.

Look, am I looking for MarketPlace or Membership?
I need to give folks UNLIMITED (which made me think 'Membership') DOWNLOADS (which makes me read 'MarketPress') for $20 a month.

$20/mo. to download whatever. Seems like this should be so simple, yet I can't figure it out.

Help.

(currently on video 4 of MarketPress Tutorial)