Recently, [jcw] wrote on the tcler's wiki mailing list:

My understanding, and intention, for the wiki has always been to make 
it as freely available as possible (a second goal for me, is to stay 
out of legal issues).

To me, that means that the wiki - which is an original collection of 
information of more-or-less original contributions - is for all 
practical purposes in the public domain.  I definitely do not "own" it 
in any sense.  At the same time, I do think that those who contribute 
have an implicit copyright - but by entering their text into the wiki, 
which is clearly a public resource (and known to be modifiable by 
anyone), I think one can reasonably argue that they are not placing any 
restrictions on the further distribution of their information (nor even 
alteration, for that matter).

Not owning it means that whatever I say is no doubt irrelevant - but if 
it makes your publisher happy: I herewith waive all claims regarding 
ownership or distribution limitations.

Another comforting fact no doubt, is that ActiveState have also 
included the wiki in full on the Tcl/Tk 2002 Conference CDROM.

If someone wants to add a note to the wiki to clarify these issues, or 
quote me, or whatever, please do - you know how to make it happen :)




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This means that if you don't like the above conditions, you should
feel free to list specific licensing agreement information on
software you have created and made available here on the wiki (or
anywhere else, for that matter).
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[KBK] (22 October 2002) - I wonder if the original poster was worried about the possibility that the Wiki might be misappropriated.  The experience of MathWorld [http://mathworld.wolfram.com/erics_commentary.html] suggests that a publisher might be interested in picking up the contents, rendering them in book form, and using the copyright on the book as a lever to shut down the original site or extort money from its operators.
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All code marked with [RS] or [Richard Suchenwirth] is definitely free as can be - do what you wish, just don't blame me ;-)

[AM] I emphatically agree with Richard on this point: any code published by me on the Wiki is freely useable, but without warrantees. I can not imagine a situation where I would publish code or text on the Wiki and not allow its usage in this way, but if this should happen, then it will be clearly stated. As I am not a lawyer, I have not much to add to the above. (Let someone with a legal background make sure that the Mathworld nightmare can not happen, though)