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With Adobe apps you have to do it through Adobe. The person selling their license has to state that they have removed it from their machines and they loose the right to future upgrades.
With software you don't actually buy the program, but you buy the right to use the program.
Adobe gives you the right to install it on your desktop machine and laptop if you own both, but it does not give you the right to use both at the same time.
They have ways to enforce this and rumor has it that they are going to go to hardware profiling. QuarkXPress is already doing this and it is absolutely impossible to install it on more then one machine. Lots of people are very upset about this since they often own a desktop and a laptop. At $1000 per copy it is a pretty steep requirement to have to pay $2000 so that you can use it on both of your machines.
Other software uses dongles. This is a little piece of hardware that plugs into your USB port and the program will not run without it. I see this a lot on RIP software with can cost as much as $20,000 per machine.
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