>> it would be illegal if put into practice > I checked my think-like-the-MPAA magic 8-ball. (1) Limit, by law, the films cinemas can show to those rated G, PG

>> it would be illegal if put into practice > I checked my think-like-the-MPAA magic 8-ball. (1) Limit, by law, the films cinemas can show to those rated G, PG, PG-13, or R. (2) Inflate the cost of applying for a rating (with a "scholarship" available to qualifying applicants). Yes, and this would be a clear example of industry protectionism, probably actionable in civil court. As an example, remember that many Silicon Valley companies are now the subject of a federal lawsuit for agreeing among themselves not to "poach" each other's engineers. The feds argue that this prevented fair wage bargaining and the seeking of professional opportunities, and they're likely to prevail in court.