Clarification on the manual license in regards to distribution

Hello,

I'm currently creating a version of the PHP 4 documentation for the 
RoadLingua dictionary system for handhelds (http://www.absoluteword.com). 
This is primarily for personal usage, but since I figure there might be 
others who could use it, I would like to ask if I'm allowed to distribute 
the dictionary as freeware, as long as I make sure the copyright 
information is in the file?

Currently the early version of the dictionary that I've made so far, has 
the following notice in the "About" box for it:
PHP 4 Manual.
Copyright (c) 2003 the PHP Documentation Group
(RoadLingua Version by Tristan Bendixen)

I hope I'll a clear reply to my inquiry, since I will only distribute it 
with permission from the author(s) of the manual.

Regards,
Tristan Bendixen