Can I install OS X Mavericks on the Macs that running OS X 10.5 and 10.6 respectively?

Greetings to the community.
I have two Macs: one is a desktop running on OS X 10.6 and a Macbook 13' running on OS X 10.5.
I have learned that Apple is no longer issuing security updates for 10.6 and wanted to upgrade to the Mavericks.
My question is: If I purchase the Mavericks disk, can I install it on both Macs or do I need to purchase two separate disks?
In other words: is the Mavericks upgrade disk a single or multiple license?
Thank you.

Mavericks is a free, downloadable upgrade, available through the App Store. There are no discs to buy.
Before you upgrade, make sure your Macs are compatible with 10.9, here:
http://support.apple.com/kb/HT5842
If your MacBook is compatible, you'll need to update its 10.5 system to 10.6 before moving to 10.9. Details about how to upgrade from 10.5 and 10.6 are here:
http://www.apple.com/support/osx/upgrade/

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