Due to player I was introduced to Space Empires III back in college, and I have been hooked ever since.
Space Empires: Starfury PC Game Free Download Full Version | Full
Images (14) Image files for Space Empires IV Gold.
All retail software uses a serial number or key of some form.
Give it a try; the shareware version is free to download from the Malfador website, and still provides hours of fun and detailed gameplay options.
Malfador Machinations – Official Site