Edit the MultiTerm termbase properties.

I have some existing termbases that were created using the GlossaryConverter and I want to add a copyright notice to the termbases. When I open any of the termbases in MultiTerm 2017 and got to Termbase Management I can see in the About panel that the Copyright field is empty. How do I edit this field and give it a value.

As far as I can see I can do this when I create a new termbase in MultiTerm. Logically I could export my termbases and then create a new termbase with the copyright notice and import the exported terms into the new termbase, but that is a very big hammer to crack such a small nut. Is there an app that can do this?

Ben