Video License Personalized Videos

We’re planning on using a few stock videos for a template video that will be used as base for personalize video exports. We’ll produce a base video (including the stock footage) and render it a lot of times with different names on it.
Do we need to get a license just once, or would it be necessary to get one each time we’re rendering a new clip?

We have a envato elements account that could deliver all the clips we need.

Thanks for your answer!

You should register a new license each time. It does not cost any money to do so but will make sure the authors get their fair share.

We will do this, sure!
But is there a faster way than to do it by hand one after one?
It would be great if I could add about 1000 licenses at once.

Ist there a way to do this?