Development of Creative Commons licenses

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

Hello,

I have an author friend who wants to incorporate a Creative Commons 
license into her commercial work.  Let me explain:

She is a retired author who writes self-published books.  She just puts a 
PDF file on her website and says "you can download the PDF before buying 
the book, if you keep the book, please pay for it".  And the PDF itself 
says that you are free to make copies for your friends.  Payment is not 
enforced at all, it's an honour system.

We are looking at how to modify this to include the CC.  One idea is to 
say "if you buy this book I'll give it to you under this CC license".

In practice, this is just like the current system.  Except that it now has 
a CC license.  So, my question is, is this legally ok?  If not, can 
someone suggest an alternative?

Thank you for your help.

Cheers,
-- 
Daniel Carrera            | No trees were harmed in the generation of
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