My reply was based on Turnoi's rather erroneous claims about policy and legislation in the West. The thread has developed from there.

The policy of this school does not prevent you giving your opinions on them as you've justed proved. You had the choice to leave the school during the contract period and you choose to do so. You had the choice to post negatively about the school and again you decided to do so. What you need to realize is that there are consequences to any action you decide to take and for that matter for any action the school decides to take i.e. they employed you, you left and now you are criticizing them. Their response to the criticism may well be to not give the glowing reference that you desire. Cause and effect. Action and reaction

If the school is withholding things like a release letter (which is needed in China to change your residence permit to a different employer) then i suggest that in the first place you take this up with the relevant authorities rather than getting into a slanging match on a public forum which is unlikely to directly benefit you in the future - burning bridges and all that!