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If the user has a premium account then he/she doesn't have to play the demo mode.
To get a premium account you must go to Minecraft.net and pay $26.98 otherwise you must play demo mode.
When you buy an account goto the launcher then login with your new username. You now have the "play" option instead of "play demo". To play the demo again simply logout of your premium account and log back in with a non-premium account.
Also, unlike non-premium accounts, premium accounts have usernames.
Having a premium account allows you to: