This code is written by Jamie Zawinski
Copyright © 2013 Jamie Zawinski jwz@jwz.org
Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.
I don't know how much plainer I can be. This code is under his copyright. I just happen to keep copies on GitHub. You can find his copy on his website at jwz.org/hacks/youtubedown
wget -N -U "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36" -i code_urls.txt