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I know Nintendo limited the amount of games a company could release on the Nes during a specific amount of time. That's why Konami created Ultra Games (which was the cover company they used to release Metal Gear). I think (but I'm not sure) that's why companies like Tengen released unlicensed games with those awesome black cartridges.

I know the Nintendo Seal of Quality only guaranteed that the product would work well with your Nintendo device or that it was approved by Nintendo but, did it have anything to do with the enforced software limitations by third parties? Was there such a restriction on the SNES or the later systems? I'm a little rusty on my Nintendo history, at the moment.