I just want to document this. I would love to be able to confirm this report, and get an idea of what the messages were. Of course Falun Gong will be blamed again. And two hours from now it will disappear. But, check out this picture from the Roger Waters concert in Shanghai. In Chinese it says 你可以重写历史但不能改变它. It means: You can rewrite history, but you can never change it.
It must be a set expression, because when I used Google to translate it the English was grammatically perfect. (If you are a student of English remember never to start sentences with "of course" or "and" or "but" nor even "I" neither, and look out for those double negatives.)