why sagenb.mc.edu cannot register?

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I just have to point out that all of what you mention, while likely true, is illegal, at least in the laws of the countries where that software is created, and (in my view) immoral. An advantage of Sage is that if there ever is rule of law on this issue in country X where it is currently not in place, Sage will still be a legal option - as opposed to "free downloads".

On a more related note, do you think that there are universities in China which would be interested in hosting Sage notebook servers, or even "cloud" instances should that technology become available in this way? Having even one notebook server per large city would really make Sage far more available - fewer bandwidth issues, etc. - and that would be great!

No worries. I did edit this a little just to preserve the more professional tone of this forum, but I certainly sympathize with your strong feelings and am sorry things are the way they are. I also hope Sage gets more uptake in China!

thank you very much! I find your mainpage,you are great teacher! sagesell is too miraculous. China teather method is fall behind......they say Abacus is best! http://www.math-cs.gordon.edu/~kcrisman/mat338/