Earth 2160 ...
- has no copy protection!
- the DVD is not needed to play the game!
- has to be activated once per installation via internet or free phone number
- the first 3 activation codes can be obtained anonymously
- the activation code is bound to hardware. You don´t need a new code as long as you don´t change the hardware. This means you can use the same code an unlimited number of times.
- you have to register to receive the 4th registration code
- Zuxxez then may or may not ask you to prove you own a retail version
- if you can prove it (or at least convince them, if you don´t have a receipt) they will reset your counter
- selling the game to another person is allowed! The buyer may have to register, but he will be treated like the first owner.
- installing Earth 2160 on more than 1 PC is allowed as long as you use only 1 at a time!
- making a backup copy of the DVD is allowed!
- Zuxxez will provide a patch to get rid of the regristration process if necessary. This ensures that the game can still be played in a few years.
- it seems even lending the game to a friend is at least tolerated
Infos based upon the publisher´s FAQ. Of course I can´t guarantee that I´ve understood and correctly summarized everything.
Sounds good to me. Install without compatibility problems, activate once, store the DVD on the shelf, play the game.

On a sidenote, Earth 2160 was released in Germany yesterday. The first reviews are coming in. If they´re right it´s a big time winner: Visuals set the new standard in the genre, audio supports some THX stuff, the balancing is great, the campaigns long and the game feature complete including skirmish mode.