Is it illegal to keep a software after it expires?

I would need to read the license to see what it says. When a software company licenses, rather than sells, software, normal copyright law does not apply. Also, many such contracts are not valid, because they have no consideration. Often, such contracts list only the rights already given by law, and then take away many rights, and charge the user a fee. Since there is no consideration given for removal of the user's rights, the contract may not be a contract at all. If the contract is presumed valid, the next step is to see what it says. try reading it yourself, or ask a lawyer. Such contracts vary greatly in what they say. This software licensing situation has led to several things, including Apple macs coming pre-loaded with software, Chromebooks interacting only with Google products, and SaaS, software as a service, where software is accessed online for a subscription or use fee.