From friendly at yorku.ca  Tue Mar  4 16:50:07 2014
From: friendly at yorku.ca (Michael Friendly)
Date: Tue, 04 Mar 2014 10:50:07 -0500
Subject: [Rd] forking a CRAN project
Message-ID: <5315F62F.6080900@yorku.ca>

There is a CRAN package licensed just as "GPL", say, XX, I want to use 
in a book.
But I've needed to modify the package to make it do what I need for 
expository purposes.
The package author(s) are amenable to my modifications, but probably 
unlikely to
incorporate them into the CRAN version any time soon.

Am I allowed, under GPL, to create a new version of the package, say 
XX2, in a
public repository such as R-Forge or github?  I would, of course, 
maintain their
authorship, though perhaps take over the maintainer role.  For my 
purposes in
the book, I don't necessarily need to release my version to CRAN; just a 
public repo
a reader could download from.

-Michael

-- 
Michael Friendly     Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University      Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street    Web:   http://www.datavis.ca
Toronto, ONT  M3J 1P3 CANADA



[Rd] forking a CRAN project
Michael Friendly