Unable to decrypt harddisk for mac

I have PGP 10.2.1 4961which I believe is MP4.  I have created a boot disk and an trying to boot from a Macbook Pro Retina that has no cd drive.

I am using an iMac in target disk mode with the cd installed.  Connected to the laptop via Thunderbolt.  When I boot, I can see the EFI boot disk, however when I select it, I get the PGP password, and end up booting into the OS.

MacBook Pro Retina OS X 10.8.2

PGP 10.2.1 4961

PGPDesktop10.2.1MP4MacOSX_WDE_Recovery.iso.cdr

iMac with Super Disk Drive connected via ThunderBolt.