License for web application

[Emiliano]

Hi all,

I'm looking for an appropriate license for my web application.
Basically, I like the GPL, but since it's a web application a
competitor could easily take my code, modify the lot, and offer it as a
service by deploying it on his own server. Since his clients would only
see the generated pages (the output of the program), and never the
application itself, he would never have to publish his changes to my
code.

What I want to accomplish is that if someone deploys a changed version
of my application he'd be required to publish those changes (or at least
send them to me and license me to use them in my free version), and that
the visitors of the generated pages would have a way to identify the
original author (me) even if the app was changed.

Emile


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