Rights and sites:- When you buy an app on the Mac App Store, you're getting the rights to run that program on any Macs you own and operate, for your personal use. Basically, if your household has a half-dozen different Macs, including desktops and laptops, you can buy a copy of Gratuitous Space Battles and play it on every single one of them. Consider a purchase of consumer software via the Mac App Store to be a bit like buying a household site license for the app.
Copy protection:- Mac App Store apps aren't wrapped in digital-rights management software, really. In fact, copy protection is not mandatory on Mac App Store apps. Developers can add an identity check if they want, though. The way that identity check works is, the app itself (not the Mac App Store App) sees if it's got authorization to run. If it doesn't, it asks for your Apple ID and password and then verifies that information with Apple. Once it gets the OK from Apple's servers, it saves that authorization and continues running. read more at pcworld
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