As far as the license clauses that Rasmus mentioned, i think these are it:
> > VI. ADDITIONAL LICENSE TERMS > > A. Distribution of "substantively modified" versions of this document is > prohibited without the explicit permission of the copyright holder. > "Substantive modification" is defined as a change to the content of the > document, and excludes mere changes in format or typographical > corrections. > > B. Commercial distribution of the work or derivative of the work in any > standard (paper) book form is prohibited unless prior permission is > obtained from the copyright holder. > and based on that assumption, i think that they are acceptable, but with modification to state "without the acknowledgement of the PHP documentation team, available at [EMAIL PROTECTED]". The point being there is that it wouldn't be so prohibitive, but would allow for us to know of works that will use it. but that's just my 2 cents. :) james