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After the user enters his / her license key, my application activates itself with that key (online). How do I store this activated state and the license key so that the next time the user opens the app, the app will know that it is already activated?
I just wrote the users license key and matching email to a file in “~/Library/Application Support/MyApplication/License.myApplicationlicense”. I think this is better than using NSUserDefaults because the user will expect to be able to toss their prefs without having anything dramatic happen like having to re-register their application.
The file is just the contents of a NSDictionary written using writeToFile:atomically: and read using dictionaryWithContentsOfFile:. The contents are not encrypted but that is typically not important depending on how your license scheme works.
I would also suggest you take a look at AquaticPrime if you have not done so already. I decided to roll my own license scheme because I wanted license codes and not license files. In the end I feel I would have been better off sticking to AquaticPrime which is much more cryptographically secure than my own license scheme. When I had been using AquaticPrime during my beta I stored the license file in the same location mentioned above.