Uplay key

I think you can add it at checkout. And yes, you can give them away.

To your worst enemies, maybe...

If you wish to add the game to your uplay client you can do so with the run commands you can find online with a simple google search, its a longer process than it needs to be. Other than that you can download the installers and from there activate to uplay.

EDIT: Link posted below.

If you don't want it, just give it to someone else

It was already used by the time I saw it. Thanks anyway.