er uh yeah
It would seem to me that you have ONE license. I believe that means you are the only legal holder of the software. The multiple activations allow only you, the holder of the license, to install the software on three of your computers.
In other words, as long as you hold the liscense, you can put the software on three of YOUR machines.
I very seriously doubt that you can sell the three activations to three different people. If you "give" the activation codes to three other people, its my understanding that each of them would have to buy a license to use the software legally.
What software are you asking about, and also, why not just write the manufacturer and ask them what you can do? I'm sure any reputable company would tell you the ins-and-outs of how you are allowed to use their product. Heck, I'd bet that they would be happy someone actually took the time to ask about the legality of transferring ownership.
People not conforming to the legality of sharing/reselling of intellectual properties is part of the problem facing music labels (for instance). If you made something for profit, would you want people distributing it (without your permission) to others for free? I wouldn't!