At the beginning of this thread, someone posted a link to the Sage worksheet:

http://abstract.ups.edu/sage-aata.html

That is 1) being publicly distributed and 2) is not being released
under the GPL.

Plus, anyone can create an account on the public Sage notebook
servers, so basically any worksheet that is Shared there falls under
this category.

Finally a quick Google for "Sage Worksheet" or ".sws" reveals *many*
public Sage worksheets, and at a glance, none of them have any
licensing information.

Now that I think about it, how would I release a worksheet under the
GPL.  The usual way is to add:

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version....etc.

to the source.  Is there a simple way of doing that?  Would it make
sense to enable notebook users to add this to their Worksheet by
simply clicking a box "Make this GPL."  Then, when a Worksheet is
loaded, if it has the GPL text, the notebook could display it or
notify the user "This Worksheet is GPLd."

Cheers,

Brian

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