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See http://www.gnu.org/licenses/gpl-faq.html#UnreleasedMods
You want to use the Affero GPL to achieve the desired effect 
http://www.affero.org/oagpl.html

That said I agree with the answer of many posters in this list: I think it 
is a bad idea to limit the use of your software like this.

P@ 

PS: I am not a lawier either:-)

On 9/13/05, debbie / theanimaro.com <debbie / theanimaro.com> wrote:
> 
> I'm working on a server program and I'm trying to decide which open
> source license to use for it.
> 
> Normally I'd just go with GPL, but there's one concern I have about
> GPL: If I'm not mistaken, it allows people to modify their software,
> and they don't have to release their modifications if they don't
> distribute the software to anyone.
> 
> Since my program is a *server* program, I'm concerned that if I release
> it under GPL, other people can make improvements to their servers, and
> run their improved servers without sharing their improvements with
> everyone else.
> 
> Is there an existing well-known open-source license that says "you must
> submit any changes you make to the author, even if you aren't
> distributing the application to anyone"?
> 
> 
> 


-- 
Patrick Chanezon, AdWords API evangelist 
http://blog.chanezon.com/
http://www.google.com/apis/adwords/

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