Dept.of Computer Science and Eng.,Shanghai Jiaotong Univ.,Shanghai 200030,China;
Dept.of Computer Science and Eng.,Shanghai Jiaotong Univ.,Shanghai 200030,China;
Dept.of Computer Science,Univ.of Virginia,Charlottesville,VA 22903,USA;
web page; watermarking; hypertext markup language(HTML); tamper-proof;