How do I zero my hard drive

Hi,
I'm selling my MacBook Pro with 10.7.5 installed on it.
I've nearly backed up all my data so next I want to overwrite the hard drive with zeros to prevent further data extraction from the hard drive.  As I understand it's called "zeroing"?   As I understand it wouldn't overwrite any software or data left over, just the "spaces" on the disk from where I deleted my other data from.
If anyone is able to help me on how I might go about doing this on a MacBook Pro with OS 10.7.5 installed on it I would be very grateful.  Also if I'm completly wrong about this please enlighten me
Thanks!
Martin.

Martin,
you’ll need to run Disk Utility to zero the free space. Select your internal drive’s volume on the left-hand side of the Disk Utility window (it’s probably the first volume underneath of the first drive listed), and then select the Erase tab. Press the  Erase Free Space… button, and choose the appropriate option there.

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