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Is this in violation of the GPL or the MySQL license?

It might technically be OK under the letter of the GPL (in the same vein as those bricks of dried grape extract people sold during Prohibition, the ones with labels saying "Do not mix with five gallons of water and store in a dark place for three months or an illegal alcoholic beverage may result"), but it's certainly against the spirit of the GPL. You could just use SQLite instead.

Peter