TTIP and TPP: what's the deal with these "secret courts"?

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These secretive quasi judicial panels that give corporations more rights than citizens are an outrage and should be junked from free trade deals.  If corporations have problems with laws or regulations of a country they should take their case to the courts of those countries.

Here is one article one these trade tribunals from a Canadian perspective:
http://www.huffingtonpost.ca/2015/01/14/canada-sued-investor-state-dispute-ccpa_n_6471460.html