Which license is recommended?

[Russell Nelson]

Alan Rihm writes:
 > Please recommend a license that does the following:
 > 
 > Requires any of our notices, including our "Powered By" tag, to remain 
 > in the UI (and source code) of our software.

There is no already-approved license which does that.  In order to
accomplish that you'll have to assert that your copyright covers
public performances (that is to say, construction of a web page).
Copyright law gives you control over that, although I don't know of
anybody who actually tries to control it.  You might find people
resistant to the idea, and since you WANT people to use your code, you
might not be successful.

You'll need to contact a lawyer.

There's certainly precedent for language that requires the non-removal
of notices; the GPL requires that an interactive program print its
copyright and GPL permission notice when it starts up.

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