Yes, written quickly and just poor phrasing on my part.It doesn't necessarily imply that they are using EF protocols. According to patent law, you can patent a new lens mount but you cannot patent the complementary mount on the lens as that would inihibit competition. Further, it is perfectly legal to reverse engineer any communication protocol provided you don't illicitly get hold of Canon's own protocols and use them partly or in full.
I should have said "It *could* imply they are using EF protocols".
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