> If Sigma reverse-engineers, they get left behind sooner than Canon's > own products, because they cannot know what points of a specification > in the Canon products are significant. But even Canon products will > eventually get left behind due to innovation.
There is innovation and deviousness. Who is to say Cannon are not reverse engineering Sigma's hack to find flaws which will render Sigma's lenses incompatible with the next model :).
If not that, it is quite possible that Canon knows what signals third-party manufacturers will find that stand out when they reverse engineer. It may be then that Canon, knowing their more complex protocol, can change it subtly without braking their own stuff but causing problems for the unlicensed competitors. All speculation, of course.
-- - Marius
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