>         9.  If all the above conditions are met, modifications to other
>             parts of this file may be freely made, although any person
>             or persons making changes do not receive the right to add their
>             name or names to the copyright strings and notices in this
>             software.  Persons making changes are encouraged to insert edit
>             history in matcd.c and to put your name and details of the
>             change there.

That's a strange clause.  Since anyone making changes will automatically 
own copyright in their changes, I think it effectively means

  I refuse to allow you to tell anyone that you might have a copyright
  interest in any changes...

That could result in a legal minefield.

R.