This is an old software. Even if you obtain a CD key for it, depending on the OS that you are using, you could encounter compatibility issues while running this. However, this program was discontinued and replaced with a new one by the developer. To obtain a CD key for the old version, you can contact the developer on the following website. By visiting the site mentioned above, you can check the new Dragon NaturallySpeaking software, that has similar features with your program.