I said "check" not "contract" for a reason. Specifically, because it creates an obligation to pay that does not require a separate contract. Copyright law works in the same way, in that it creates an obligation to pay that does not depend on an additional contract between parties.

Obviously, there are exceptions to this rule. That is to say, copies that can be made without triggering a corresponding obligation. These are gathered under the Fair Use provision of the law.

There are also criminal and civil violations within copyright. But the larger point is that refusing to pay money owed is very much a form of deprivation.