http://store.steampowered.com/promotion/familyshar ing

Ve F.A.Q. je napsáno:

1) Can region-restricted content be shared across regions?
No, any region restrictions will remain in place when lending or borrowing content.

2) Can all Steam games be shared with friends and family?
No, due to technical limitations, some Steam games may be unavailable for sharing. For example, titles that require an additional third-party key, account, or subscription in order to play cannot be shared between accounts.

Jinak se knihovny sdílejí úplně celé.