Z:gnu-www-ja-x--c04440-When you work on the core of X/en

When you work on the core of X, on programs such as the X server, Xlib, and Xt, there is a practical reason not to use copyleft. The X.org group does an important job for the community in maintaining these programs, and the benefit of copylefting our changes would be less than the harm done by a fork in development. So it is better to work with them, and not copyleft our changes on these programs. Likewise for utilities such as xset and xrdb, which are close to the core of X and do not need major improvements. At least we know that the X.org group has a firm commitment to developing these programs as free software.