Development of Creative Commons licenses

[drew Roberts <zotz AT 100jamz.com>]

I am having a discussion with someone that resulted from my reading his page 
here:

http://www.incompetech.com/music/collections/royalty-free/rock.html

The questin has come up:

What does sublicense mean in section 4.a. here:

http://creativecommons.org/licenses/by/2.0/legalcode

"You may not sublicense the Work."

all the best,

drew
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