I do not think he is talking specifically about the code. From http://www.gnu.org/doc/gnupresspub.html http://www.gnu.org/doc/gnupresspub.html: "GNU Press publ

I do not think he is talking specifically about the code. From http://www.gnu.org/doc/gnupresspub.html http://www.gnu.org/doc/gnupresspub.html: "GNU Press publishes ...books on computer science using freely distributable licenses... We believe the reader should be free to copy and redistribute it, just like our software". I do not know what right readers have to distribute ACL, but if it is in anyway restricted then I would guess that is what he means.