SDP Search via BlueZ
On Linux, Qt Bluetooth uses a separate executable, sdpscanner, to integrate with the official Linux Bluetooth protocol stack ( BlueZ ). The usage is limited to service discovery via SDP. The Qt Bluetooth library itself does NOT link against BlueZ . Communication between sdpscanner and QtBluetooth happens via stdin/stdout. Therefore QtBluetooth and user code linking to it is not considered a derivative work, and does not have to be released under GPL too.
The sources can be found in qt5/qtconnectivity/src/tools/sdpscanner.
Copyright (C) 2000-2016 BlueZ Project.
