Pre-Purchase License Questions

Hi,

We are planning to buy a commercial jwplayer license for one of our website. We have few questions regarding that.

1) Do we buy license just once? Or is it per year? (I understood its just once but want to confirm.

2) If we buy Single Skin, Which skin does that include? Is it a fixed skin or can we select from a list of skins?

3) Google Analytics Pro: How does this work? Does it give us some sort of script that we can just include on the site and it works? We already have an analytics account that we are using for our site. Can we use that same account# with this script? And How does this work? Is there some tutorial (and documentation) on how do we use this?

Thanks

Thanks