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On a normal PC, one can enter Bios, set HDD as primary boot devices and lock Bios with a password.

Is there any way of preventing a MacBook from being bootable with any pirate live disc medium?

It's not only about data security, but also I don't want Joe Schmoe to overwrite my HDD with e.g. a Linux install.

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up vote 1 down vote accepted

You can set up a firmware password and then disable the ability to press C to boot from CD. See Setting up firmware password protection in Mac OS X

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Ah, via a GUI - and only using MacOS. That's so Apple... – arney Apr 23 '13 at 9:15
    
There is also a command line tool: jamfnation.jamfsoftware.com/article.html?id=58 – Matteo Apr 23 '13 at 9:21

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