One, of course, is the ban on discussions of the subject itself.
School authorities monitor popular Internet chat sites for any hint of anti-government sentiments.
Whether due to this increased vigilance or not, there is little sign of any plans to mark the occasion. Outwardly, it even appears that government propaganda efforts have been successful. A Communist Youth League leader declares that some things are more important than the ideals spouted by youthful protesters a decade ago. Yet behind the wall of government-imposed silence, people are privately discussing the legacy of the crackdown. Li Zhanghan, an old rightist, insists that the students were right in protesting against corruption and advocating free criticism.