Purchase key - for Windows and Mac?

[zactor]

Hi there,

i have A question, before i buy a license key: Can i Use the key for my Windows Computer AND my Mac? I really like to buy a key, but if i can not use it on both devices it wouldnt really change the situation. Or is it possible to use it today on the one and tomorrow on the other System?

Best regards
Tim

[Woodstock]

And on Linux, too...