My hands are itching
With UT, the basic premise and philosophy is that all the mods and mutators be open source, copywrited by respective authors, but open source nevertheless. Now some, read anticheat devs (and from that crowd some, read Tnse, have undergone redemption by releasing the UTPure source and all that), have taken advantage of Epic's goodwill and started obfuscation and what not, which is PURE WASTE OF RESOURCES. This is quite illegal in my books and discouraged whereever possible.
/My hands are itching
I admire proasm and none and their coding style. They are practically open source because if you ask them nicely, they do provide the source.