Password Reset From Installation DVD, Is This Secure?

So one of my customers is looking into purchasing a few macbook pros. I just bought a 13 inch (mid 2009). I recently discovered that I can reset my root and admin account passwords all by inserting my install dvd.
Is there a way to prevent passwords from being able to be reset using the install dvd? Or by any other reasonably simple method.
It seems extremely insecure to have laptops that can be stolen or misplaced and all that needs to be done to access the data is to insert a common dvd disk.
Am I looking at this wrong? This is just my first impression, I would love to learn how to look at this issue properly.
Thanks!

Niel wrote:
Set a firmware password on the computer.
It's easy to bypass firmware passwords on Macs, so it doesn't add any real security if the "attacker" can use Google.

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