How to set Copyright Text for Termbase file


Hi
We have developed a console application (C# language) which produce termbase files (.sdltb file) using Sdl.MultiTerm.TMO COM component which is installed with SDL MultiTerm 2017.
we have successfully create the file.
Now I want to set the CopyrightText property which is member of MultiTermIX.ITermbase; but I can not set it, because it is read only. I cannot find any other property to set it.
please help me.
thank you.