What's considered a commercial site (sites that should pay the license fee)?

I don't know what is considered commercial in certain instances, but in general, a commercial site is one that sells something. I don't know if having a banner to sell something, or a search field for a commercial site (such as Amazon.com) counts, but if you have a store online, that would definitely be commercial.

I'm not the webmaster or anything, but thought I'd offer an answer that might help some.

I am assuming that if you qualify as not-for-profit, you are considered non-commercial. On one of my sites, I have an Amazon associates bookstore, which makes about $30 a quarter, almost enough to pay for the web hosting. I don't think that can be called commercial.

Right?
Phoenix