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> They are selling it.

Do you mean rent? See parent poster's clarification for the term "buy":

> and when I mean buy, i do not mean "rent for a non specified duration"

How is it renting? You purchase a license. At no time do you ever transfer this license over to someone else to "return the rental license."

The licence can be revoken at any given time. This might not be renting, but it is not buying.