Does Apple is blocking the development of 3rd party IOKit kernel drivers/Exentions..?
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Your question doesn't make much sense. As far is Apple blocking such extensions, I would say doubtful for the very reason that printer & scanner drivers use extensions, and there are extensions such as Symantec Endpoint protection and Adobe Flash.
They may be subject to specific guidelines by Apple what fits their Sandbox principles. For more details if you are a developer, sign up for the http://developer.apple.com/ account, and work with Apple on what you want to run on their platform.
