>There is a long history on this topic, but the short summary is: We've looked at this extensively and concluded that releasing UE2 & UE3 source would be impractical due to the large number of integrated third-party libraries which have limitations on redistribution. The public source code release only became practical with Unreal Engine 4, due to an extensive effort to clean up external dependencies.
>UE1 might be possible at some point in the longer-term future, but that would be more for nostalgia than practical utility.
>There is a long history on this topic, but the short summary is: We've looked at this extensively and concluded that releasing UE2 & UE3 source would be impractical due to the large number of integrated third-party libraries which have limitations on redistribution. The public source code release only became practical with Unreal Engine 4, due to an extensive effort to clean up external dependencies.
>UE1 might be possible at some point in the longer-term future, but that would be more for nostalgia than practical utility.