With legal drugs, the term leasing would be interesting or using like software would also be interesting.  How would would you return the drug after you used it and it didn't work?  With software I agree to uninstall it and return any delivery media to the original owner.

In the US, cars are unique in law since they basically are under the rule of "You buy it, you are stuck with it after a short period of time".  With general aviation (personal aircraft) you could sue the manufacturer decades after the plane left the factory for example.

oh well, it seemed funny when I started writing this, but it isn't.  See the drug return would have been in bottles filled with ... well, ok.

Ok, software licensing is confusing.Perplexed