/etc/bluetooth/network.conf is in bluez 5.23-2+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # Configuration file for the network service
[General]
# Disable link encryption: default=false
#DisableSecurity=true
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