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It seems people are usually quite keen to licence their engines to others. Troika (who wrote Bloodlines) just licenced the engine used in Half Life 2, rather than writing one themselves. Lots of people used the Quake 3 engine in games. But it was just a passing thought, probably not worth a big debate (just the way I'd be tempted to investigate if I was doing it - but I'm a hardware engineer anyway :-)
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