Cloud License allows 2 activations http://www.adobe.com/legal/licenses-terms.html
-Install on a 2nd computer http://forums.adobe.com/thread/1452292?tstart=0
-Windows or Mac does not matter... 2 on the same operating system, or 1 on each
-Both activations MAY NOT be in use at the same time (note in the above license link)
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Your subscription allows you to install on as many machines as you like. Of all the machines you install on you can only be signed in on two of them at any time. Of the two machines that you are signed in on you can only be using the subscription on one at a time. YOu can sign out and in on different machines as needed.
Okey ! thank you so much for answers !! And I hope I'll enjoy Premiere pro !