Frequently Asked Question
Both Regular and Extended licenses entitle you to use any product (web application or plugin) to create a single website.
What it means in practical terms is that not only you are not allowed to run multiple copies of the product on more than one website (domain) at a time, but also you are not allowed to use the same license to start another website even if you stop using, sell or delete the previous one. Basically, you need to purchase a new license for each single use of the product.
Exception is made when you migrate from a development environment / domain to production.