Adobe Acrobat Reader DC useage limitations of free copy

I just downloaded a copy of  Adobe Acrobat Reader DC 932bit)

It is a free version but it said there was some limitations on the useage but I do not see waht they are.

Small seniors (65+) ski club with members with little technical ability require product to sign pdf's

Before I recomend this product to others, i need to know what they are

limits to the number of times it is used?

limits to being able to sign a pdf form?

Is it totally a free product or am i going to get a bill later?

thnaks

Ronald Brown