I was looking at the GHG calculation code, and it is copyrighted by Airbus. Does anyone know if it is normal for open source projects to contain code copyrighte

I was looking at the GHG calculation code, and it is copyrighted by Airbus. Does anyone know if it is normal for open source projects to contain code copyrighted by corporations? https://github.com/os-climate/witness-energy/blob/develop/energy_models/core/energy_ghg_emissions/energy_ghg_emissions.py https://github.com/os-climate/witness-energy/blob/develop/en...