It's my understanding that you can still charge for the book, but if someone then uploads it for free sharing, you can't complain.
Basically, the share-alike clause "grandfathers" the license so that the next item has the same license. Which would mean that anyone who gets a copy of the work has the right to:
Quote:
You are free:
to Share — to copy, distribute and transmit the work
to Remix — to adapt the work
to make commercial use of the work
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I think this also means that someone could charge money for your work, since that would count under "commercial use".
I use a CC license on my book, but not this flavor. I don't like what this seems to be saying, personally.
ETA: Mind you, I am not an expert on this. Let us know what you hear back.