Alex Pui wrote:
I confess that I am not expert on GPL. But by reading the following link, I
still don't find which part gave Digium and only Digium the right to make
money on Asterisk licensing?

Precisely the point.

You can go and make money with asterisk. I can go and make money with asterisk. Digium/Mark can make money with asterisk.

Here's the difference:

Mark can sell people copies of asterisk that are not GPL'ed, therefore the buyer can do whatever their non-gpl'ed license says they can do with the code, including selling compiled copies and not giving out the source.

You and I can sell a solution that includes asterisk, but we can't sell a license to use asterisk. We can grant it to someone*, based on the license as it was granted to us, but we can't sell someone a customized compiled copy of asterisk _without_ giving them access to the modified source.

*I might not have the terminology exactly right here, but there's flamewar every day on a open-source list mailing list somewhere that explains it better than I can.

--
Andrew Thompson
http://aktzero.com/
http://dev.asteriskdocs.org/
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