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I've done extensive reading on this, but I'm still stumped. I'm trying to call USBInterfaceOpen for a USB Device that I need direct read/write access to, but I get an exclusive access error. There seem to be 2 possibilities here: 1) use the HID interface or 2) do a codeless kext to get to the device before OS X's HID Manager does. So possibility 1 is not going to work, it's not recognized as a storage or network device and nothing is created in the /dev tree that would allow standard POSIX calls. And possibility 2 is not going well. Apple seems to have really locked things down, and I get "Bad code signature" errors when loading trying to load my codeless kext (with just a .plist): Authenticating extension failed: Bad code signature" UserInfo={NSLocalizedDescription=Authenticating extension failed: Kext com.blackrock.cerestim v1.0.0 in codeless kext bundle com.blackrock.cerestim at /private/var/db/KernelExtensionManagement/Staging/com.blackrock.cerestim.ohqHdy/Cerestim.kext: I am really stuck. Is there any simple way of preventing an HID takeover of this device?