Regardless of if you have to, you still should. However, I would assume if the 
code is for educative purposes, you could argue fair use if you don't use a lot.

----

Cole Johnson
-- E-mail: [email protected]
-- Twitter: @5urd

Hexware, LLC
-- Twitter: @HexwareLLC

On Sat, Dec 14, 2013 at 3:54 AM, Mingjie Xing <[email protected]>
wrote:

> Hello,
> I think maybe this is a good place to ask a question about GFDL. Say I
> am going to write a book talking about the implementation of a GPLed
> software. Many source code will be quoted and analyzed in the book. So
> my question, is there any constraint about the publishing book? Must
> the book be covered as GFDL? Thanks.
> Best Regards,
> Mingjie

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