Software sold to Europe, VAT Applies?

Hello,

I'm planning on opening an eCommerce website in a niche market. The website only holds a digital inventory of license keys for certain software. We do not host the software itself.

My question is this: If I am a U.S based seller, how does VAT apply to me when I sell the software to UK, France, or Germany customers? Is there anything I should know about?

Regards,
Ryan