Doubts Component eshop

How many times I can use the component eshop.
The component is a lifetime or every year you have to be renewed payment.

Dear Rodra,
As our TOC, after purchasing EShop, you can download upgrade as free within 1 year. You can install it on any your sites.
Sincerely, Giang

After a year I have to pay again.

Yes if you need to upgrade after one year!
Sincerely, Giang

Rodra, this is generally how joomla extensions work. You pay for a period in which you get support and product updates and when your subscription expires you can still use the product but dont have access to ongoing support and new releases.