The Store’s app licensing model centers on the idea of providing customers with access to all of their apps on all of their Windows 8 devices. It gives customers control over their apps and keeps them connected to those apps across the multiple PCs that they’ll use over time. They can get updates for apps, write reviews for them, reinstall them on a new PC, and share them with their families. At the same time, the Store’s app licensing model provides developers with built-in protection against casual piracy, so that they can confidently build a business around developing apps for Windows 8 PCs.

These days, people may use several PCs in the course of their daily lives, or share PCs with more than one person in their household. We want these customers to have access to a great Windows 8 experience on all of those PCs.

The licensing terms allow customers to install and use their apps on any user accounts on up to 5 PCs. Why only 5 PCs? Because we also believe in the value of the developer’s investments in their apps, and we want to protect that investment from abuse.
Say, for example, that your family has a shared PC. You have previously used your Microsoft account to purchase a game that all your kids like to play. You can install it for each of your kids by having each of them sign in to their Windows accounts on the shared PC, then launch the Store and sign in to the Store using your own Microsoft account. There, you’ll see all your apps and you can re-install the app on your kid’s Windows account. Installing apps on multiple user accounts on a shared PC still only counts as one of the five allowable PCs where you can install apps.