Sins of a Solar Empire is a realtime strategy game from 2008, developed by Iron Clad Games and published by Kalypso Media in Europe and Stardock in the US. It is set in a space simulation like environment. You can control starships, do research and build up planetary infrastructure. This game should not be confused with the very similar successor Sins of a Solar Empire: Rebellion. Both feature a very similar game play.
The game comes via a DVD. Simply install it and use the DVD key. It does not require any crack, as there is no DVD check. Only a valid DVD key is required.
At some point the game seemingly used to have an internet multiplayer. At least with version 1.5 today, there is only a LAN multiplayer.