How many Mac OS Lion files do I need to buy?

I own several Apple machines and need to upgrade the software on all of them. 
Can I use the same download for each of them or do I need to pay for multiple copies?

If this is OK and will work, will she need to log in with my account details when updates become available?
Updates to Lion will come through Software Update, not the Mac App Store.
You can use the installer you download using your account to install on all the Macs in your household. Just remember to save off the installer before you install Lion, so you can then make a bootable USB drive.

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