It's not just university professors who are plagiarists in China. Many lazy students here have cottoned on to using the net to provide them with quality material to plagiarise for their assignments. When confronted regarding this, they will insist they are innocent, despite the excellent English in their submissions being incommensurate with their poor English.
Not only plagiarism, but also Chinese teachers taking professional exams on behalf of friends, relatives and former high school/university classmates is another deceitful practice here. In this way, my Chinese colleagues can boost their incomes substantially by accepting bribes. Dishonesty among teachers is rife. That has surprised me very much!