Selling licenses for use in proprietary software is not selling GPL software. In particular, I can not sell you a proprietary x264 license for software that I received under the GPL.
Dual-licensing effectively says, "We'll let you take away user freedoms, but only if you pay the original copyright holders." Which is akin to openly bribing communist party officials.
Dual-licensing effectively says, "We'll let you take away user freedoms, but only if you pay the original copyright holders." Which is akin to openly bribing communist party officials.