propeller vs bluetooth hci

Just an update after long long silence. I am now trying to befriend Parallax Propeller with PAN1320 Bluetooth module.
Starting point (thanks Micah Elizabeth Scott) and Bluetooth specification.

One thing I do not understand about BT modules, why are all module manufacturers so secretive and require NDA to be signed to give you user manuals/datasheets? Really, wtf?

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