As long as the installation files are legally owned and installed on 
only one machine, installing Mac on a Windows PC is legal;
http://www.hackintosh.com/
So to avoid piracy if you want to set up multiple machines for use 
you'll have to either to re-license each Mac installation, or you can 
use any of the many flavors of free Linux with no licensing or 
registration fees.
Most builds of Linux are free and all the free ones can be installed on 
an unlimited number of machines. Several builds of Linux also have OEM 
(Original Equipment Manufacturer's) installation file sets, also for 
free. Linux Mint has only one desktop style available in OEM, the Mate 
style, which happens to be my pick of the litter. 
http://www.linuxmint.com/release.php?id=22
Ubuntu has standard download files and from what I understand, during 
the DVD Live Load installation you can press F4 to get the OEM option. 
http://www.ubuntu.com/download/desktop
I don't have any idea if the Vinux rebuild of Ubuntu has this feature 
untouched or not. It'd be worth a try. 
http://wiki.vinuxproject.org/index.php?title=Main_Page#downloading_vinux
OEM installations let you pre-install Linux and when the end user starts 
up the machine, they will be prompted through setting their own user 
name and password and some other details to customize their system. That 
way you don't have to assign user names and passwords and then the end 
user won't have to get into setup settings and changing all that for 
themselves if they feel the need.


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