Can I move the OS X that was preinstalled on my MacBook pro to a VM running on the MacBook Pro?

I would like to run linux as the primary operating system on my MacBook Pro to replace the OS X that was pre-installed with the MacBook.

I would then like to run OS X inside a virtualbox guest running on the MacBook.

1. Is this configuration legal from a licensing perspective?


2. My mac book was pre-installed and there wasn't an installation CD in the box. How can I get the OS X installation image for installing into Virtualbox?

UPDATE: I have NOT purchased a copy of OS X, and I do not wish to purchase one either :)