InspIRCd v4 is still early in development!
If you use this branch you may experience crashes, weird behaviour, and unannounced breaking changes.
You probably want to use InspIRCd v3 instead.
The "topiclock" Module (v4)
This module allows services to lock the channel topic so that it can not be changed.
To load this module use the following
This module requires no other configuration.