How to recover a locked recovery disk on Mac OS lion

Is this a recovery disk you created with your own custom information? Use this tip:

Recovering data from Macs - Apple Community

Or do you just want the recovery disk used to install Lion?

command-option-shift-R with an USB keyboard lets you reinstall the oldest version of recovery supported by the Mac. This is only for Macs that came with Lion or later. And this only installs the oldest OS that shipped with the Mac

Some Macs that had a firmware updated will also allow you to reinstall Lion that way. Others, you need the Snow Leopard retail installer, and get the necessary updates and upgades to Lion.