Clearing Data from MacBook Pro

See -> Prepare your Mac for Sale.

And -> What to do before selling or giving away your Mac.

Good luck,

Clinton

Before you sell your MBP to anyone you have to repartition the drive and reinstall the original version of OS X that came on it when it was new. Depending on what version of OS X came on it when it was new the steps to do that are slightly different.

So what model year is your Mac and what version of OS X came on it when it was new?

You can not sell it with one of the download only version of OS X installed on it unless that version came on the system when it was new. Those versions of OS X that you bought, Lion and Mt Lion, or downloaded for free, Mavericks, from the Mac App Store are tied to Your Apple ID and can not be transferred to another individual.

Before you sell or give away your computer, in addition to the steps mentioned in this support article, take these steps:

• Run the Apple Hardware Test or Apple Diagnostics. The buyer will do this (or he should), and you don't want to be surprised by the results.
• Reset the PRAM and the SMC, which might contain personal information.
• If you set a firmware password, remove it by running Firmware Password Utility in Recovery mode.
• If you activated FileVault in OS X 10.7 or later, turn it off.
• If you use Boot Camp, the partition must be deleted
• If you created any other data partitions on the internal drive, remove them in Disk Utility.
• Erase the data partition(s) with the option to zero out data. An SSD doesn't need to be zeroed.

You can't legally or practically transfer any software downloaded from the Mac App Store to the new owner of the machine, even if it was free. That includes OS X, so if you upgraded to OS X 10.7 or later, you must reinstall the original OS, either from the installation media, if applicable, or by booting into Internet Recovery (option-command-R at the startup chime.) If you installed from discs or a read-only USB key, deliver those to the new owner.

The new owner will have to repurchase the software, if need be, under his or her Apple ID. If you ever updated the bundled iLife applications (Garage Band, iMovie, and iPhoto) through the App Store, you can't transfer them either.

Remove the machine from your list of registered products. If it's still covered by an AppleCare Protection Plan, transfer the coverage to the new owner by following the instructions in the AppleCare Terms and Conditions (under the heading "Transfer of Plan.")