Development of Creative Commons licenses

[Daniel Carrera <dcarrera AT math.umd.edu>]

Greg London wrote:

> Money changes hands, you break the license.
> Seemed pretty clear to me.

It seems ambiguous to me. Money changes hands all the time. How do I 
decide when money changed hands in a way that infringes the license? For 
example:

* If work is a book. Can I study the book and what I learned to get a 
job? Is what "for commercial purposes"? Does that break the license?

* If the work can be used to help me provide a paid service. For example, 
suppose I'm a teacher, and I use the work to teach. Is that commercial?

* If I use the work to advertise another product. Is that commercial?


It is most definitely not clear.

Cheers,
-- 
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