I will start by saying that this worked for me.
This is a 1:1, no cracks introduced.
Using the latest Blindwrite 4.2 and CopyToCD 1.0.2.
LTD 163D DVD
LTR 2410B CDR-W
Nothing special here, used the default settings, max speed read and write.
Did the CD from start to finish in about 8 mins.
Unistalled UT2003 from the original, inserted the BACKED up CD (Did not autostart for some reason), ran the setup file and hey it installed. Went to play the game, again with the backed up CD (CD1) and it ran.
Seems pretty conclusive my end. As I said it is not cracked or modified in any way.
Please try it and let me/us know how you go.