SCCM 2007, when programs need serial number

Good morning everyone,
I am trying to deploy a piece of software using SCCM 2007, I thought myself how to use it so I’m not really good at it yet (have the MS book)
I have successfully deployed software and updates before, but this is the first time I try to deploy something that need a serial key in the installation process. and I don’t know how to add the AK to the package.

any advice will be greatly appreciated

thanks

-D