Original sentence: The fact that software from 1999 continued to be worth considerable licensing fees by the market at least until 2004 is a testament of its quality
Edited sentence: However, the higher licensing fees and limited application of the Doom 3 engine has pundits wondering whether it can hold its own against the Half-Life 2 Source engine.The fact that software from 1999 continued to be worth considerable licensing fees by the market at least until 2004 is a testament of its quality, with only the Unreal Tournament 2003 engine eventually replacing it as the choice licensing engine