Software licensing

For information, the license that I am looking into for IVOA projects use is the Common Public License:
  http://www.opensource.org/licenses/cpl.php

I have a question about point *18* which I've directed to the authors (IBM):

'Does this mean that a commercial company who makes use of a portion or all of our code and wishes to sell that modified code, must make the source code of their amendments available?'

Basically I wanted to make sure any code produced is freely available with no constraint on its use except to keep copyright notices in the code.

I'll update this list when I get a response.

Cheers,
Tony.

__
Tony Linde
Phone: +44 (0)116 223 1292 Mobile: +44 (0)7753 603356 Fax: +44 (0)116 252 3311 Email: ael-at-star.le.ac.uk Post: Department of Physics & Astronomy,

        University of Leicester
        Leicester, UK   LE1 7RH

Project Manager,            Director,
AstroGrid                   Leicester e-Science Centre