derivative works question

[Kerry Watson]

Hi, I'm new to the list, sorry this is not an esoteric question like
I've seen discussed since I subscribed. 
 
Anyway, I am trying to find out if it is acceptable to write a book
about an open source software program? I am talking about a users'
manual for a program that states that it is subject to the OSI terms and
license. I can't tell from the language whether a book would be a
"derivative work" etc. I can't find any limitations about books or
users' manuals. 
 
Any help and guidance would be appreciated. 
 
TIA
Kerry
 
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