Some sellers on Ebay will sell a used computer with an operating system already installed. Most don't include a reinstallation disc. Still, if the OS is ultimately tied to the motherboard's serial number, does the buyer of the computer now "own" the license for the use of the OS? I ask because I'm wondering if it's possible for someone who buys a used system like this to call the vendor (like HP or Dell) and request the reinstallation disc be sent to you.