Technically you didn't buy a Norton Antivirus, you entered into a license agreement. Software is, unfortunately, almost always leased and not bought. However, I would very much be into forcing companies to either a) keep their service running forever, or b) allow the user to use a third-party service - in this case, virus definitions. This is in line with my comment elsewhere in the thread - companies should be allowed to either a) sell a product that doesn't require a service, and if it uses a service, it should support compatible third-party services as well, or b) lease the product as a part of a service. They should explicitly be banned from selling a product that requires their particular service to function.

As for Sony, PS1 games and on-line: similarly, whatever middleware there is that facilitates on-line gaming, endpoints should be user-configurable. Fortunately, at least PS1 the device doesn't require Internet to run.

(Come to think of it, did PS1 even support an Internet connection?)