If I sell a base package of software, and the same codebase has advanced functionality sold as an option/upgrade, with the only difference being the software ke

If I sell a base package of software, and the same codebase has advanced functionality sold as an option/upgrade, with the only difference being the software key used to activate the software, and a version of my software fails the key validation and gives you everything, am I now required to upgrade you to the full version forever?