Ground, Data + and Data - need to be connected, 5v+ does not. I posted an image quite awhile ago which illustrates how to wire a camcorder for extended unlock.

Obviously, using an ordeal of cables isn't very discreet, but you did ask permission from the CVS employee first, right? :wink:
All the PD processing stations should have front mounted USB ports now, but prior to that, I convered a CVS Blue PV2 camera into a PureDigital-to-USB adapter with a AAA battery holder built right in. That plus my palm cable is all it takes.

I still have to admit though, Brite's PV2 key catch is a far more elegant solution. No messy cables or batteries, no potentially killing the USB ports on the processing station due to shoddy soldering...