vba powerpoint module and userform

I require a vba module/macro and userform written for powerpoint 2007/2010. This will form the basis of an addin for powerpoint. This is not a .com add-in. The required function is to act as a verification of a serial number or similar to register the add-in. I require an experienced developer who can advise on the best solution although I realise nothing is totally secure. I guess this would look for something unique to the pc Macid or similar or generate a random sequence/string written to the registry and some form of algorithm to provide a serial number. The xml ribbon menu would be registered on success (this should be provided also) and without the add-in registered the ribbon menu would be non functioning. This is an on going project and we and there will be more complex work required in the near future.