Can I use the template on several sites (2-3 domains)?
With
1 license = 1 site
2 license = 2 sites
3 license = 3 sites
How much is 1 license and how long does it work?
Prices vary depending on the item but you can use it until the end of time.
I purchased a template.
In order to use it I have additionaly to pay the license?
Or license is included in the price of template?
You will need to buy that template again… and… again, for each new domain 
OK. I need only one template for only one domain. This I already have.
But what about license?
License is included in the price of template?
How long time the license is valid?
You purchased a template once, you can use it on 1 domain forever.
You want to use the same template on another domain? Purchase it again and use it on that new domain forever.
You have purchased the file once so this gives you 1 license (that is what you are buying) and allows you to use this file on one website forever.
If you want to use it elsewhere then you buy the file again each time which gives you a new license each time.
Every time when you will buy that theme, a new license will be generated
Thank you!!!