It seems to be a v2/v3 split. From https://github.com/kerberos-io/opensource/blob/master/README.md (emphasis mine)
Kerberos Open source (v3) is a cutting edge video surveillance management system made available as Open Source under the MIT License. This means that all the source code is available for you or your company, and you can use, transform and distribute the source code; as long you keep a reference of the original license. Kerberos Open Source (v3) can be used for commercial usage (which was not the case for v2). Read more about the license here.
To me (IANAL, etc) it seems the license shouldn't be a particular problem as long as it's based on v3.