Lion has arrived, a common question that is around the web : “Once bought, how many Macs can install the same copy?”. Well, not a definitive answer now seems to be (or maybe), but during the first presentation of Lion during the WWDC 2011 was projected a slide that can help to clarify the matter.

Returning to the text of the slide:

“All Your Macs Authorized” – “All your Macs allowed”

Well this seems to be the definitive answer. But how many Macs can be authorized to the same Apple ID?

To answer this question, for safety, I went to check on the Apple site in part intended to assist users. With a quick search I ended up in this page, in which you can read:

“You can sync or use your Purchases from the iTunes Store on up to five different computers (These can be Any mix of Macintosh or Windows-compatible computers). When you sync or play an item you’ve Purchased, your computer is” Authorized “for purchase using your Apple ID.”

ie:

“We may use or synchronize your iTunes Store purchases on up to 5 different computers (these can be either Windows or Mac). When using or sync a purchase, said the computer is” authorized “for purchases made ??with its Apple ID “.

It seems then that the copy you have just purchased a Lion on a Mac App Store for € 23.99 is used on all the Macs in your house as long as these are at most 5. No single license then, but only the so-called family license that allows use of the same copy of software on up to 5 personal devices.

The same policies, remember, are applied to all purchases made on iTunes, and the various Apple Store.