For a period of up to 3 years after your purchase, a full distribution of source code and notes for libusb-1.0.0.dylib can be downloaded from the link, https://www.duxburysystems.com/downloads/lgpl/libusb-1.0.24.tar.gz, or it can be requested on physical media by contacting Duxbury Systems. For physical media, a fee to cover our expenses will apply.
Libusb v.1 is made available under the GNU Lesser General Public License version 2.1 or later.
The following text is copied verbatim from the README file included with the libusb distribution:
libusb is a library for USB device access from Linux, macOS, Windows, OpenBSD/NetBSD, Haiku and Solaris userspace. It is written in C (Haiku backend in C++) and licensed under the GNU Lesser General Public License version 2.1 or, at your option, any later version see COPYING.
libusb is abstracted internally in such a way that it can hopefully be ported to other operating systems. Please see the PORTING file for more information.
libusb homepage: http://libusb.info/
Developers will wish to consult the API documentation: http://api.libusb.info
Use the mailing list for questions, comments, etc: http://mailing-list.libusb.info
(Please use the mailing list rather than mailing developers directly.)
The following text is copied from the AUTHORS file included with the libusb distribution:
Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
Copyright © 2010-2012 Peter Stuge <peter@stuge.se>
Copyright © 2008-2016 Nathan Hjelm <hjelmn@users.sourceforge.net>
Copyright © 2009-2013 Pete Batard <pete@akeo.ie>
Copyright © 2009-2013 Ludovic Rousseau <ludovic.rousseau@gmail.com>
Copyright © 2010-2012 Michael Plante <michael.plante@gmail.com>
Copyright © 2011-2013 Hans de Goede <hdegoede@redhat.com>
Copyright © 2012-2013 Martin Pieuchot <mpi@openbsd.org>
Copyright © 2012-2013 Toby Gray <toby.gray@realvnc.com>
Copyright © 2013-2018 Chris Dickens <christopher.a.dickens@gmail.com>
Other contributors: Aaron Luft, Adrian Bunk, Adrien Destugues, Akshay Jaggi, Alan Ott, Alan Stern, Aleksandr Mezin, Alexander Pyhalov, Alexander Schlarb, Alexander Stein, Alex Vatchenko, Andrew Aldridge, Andrew Fernandes, Andy Chunyu, Andy McFadden, Angus Gratton, Anil Nair, Anthony Clay, Antonio Ospite, Artem Egorkine, Aurelien Jarno, Axel Gembe, Aymeric Vincent, Baruch Siach, Bastien Nocera, Bei Zhang, Bence Csokas, Benjamin Dobell, Brent Rector, Carl Karsten, Chris Zhu, Christophe Zeitouny, Chunyu Xie, Colin Walters, Dave Camarillo, David Engraf, Davidlohr Bueso, David Moore, Dmitry Fleytman, Dmitry Kostjuchenko, Doug Johnston, Evan Hunter, Federico Manzan, Felipe Balbi, Florian Albrechtskirchinger, Francesco Montorsi, Francisco Facioni, Frank Li, Frederik Carlier, Gaurav Gupta, Graeme Gill, Greg Kroah-Hartman, Gustavo Zacarias, Hans Ulrich Niedermann, Harry Mallon, Hector Martin, Hoi-Ho Chan, Ido Yariv, Igor Anokhin, Ihor Dutchak, Ilya Konstantinov, Jakub Klama, James Hanko, Jeffrey Nichols, Jie Zhang, Johann Richard, John Keeping, John Sheu, Jonas Malaco, Jonathon Jongsma, Joost Muller, Josh Gao, Joshua Blake, Joshua Hou, Juan Cruz Viotti, Justin Bischoff, Karsten Koenig, Kenjiro Tsuji, KIMURA Masaru, Konrad Rzepecki, Kuangye Guo, Lars Kanis, Lars Wirzenius, Lei Chen, Léo Lam, Luca Longinotti, Marcus Meissner, Markus Heidelberg, Martin Ettl, Martin Koegler, Martin Thierer, Matthew Stapleton, Matthias Bolte, Michel Zou, Mike Frysinger, Mikhail Gusarov, Mikolaj Kucharski, Morgan Leborgne, Moritz Fischer, Nia Alarie, Nicholas Corgan, Omri Iluz, Orin Eman, Patrick Stewart, Paul Fertser, Paul Qureshi, Pekka Nikander, Philémon Favrod, Pino Toscano, Rob Walker, Romain Vimont, Roman Kalashnikov, Saleem Rashid, Sameeh Jubran, Sean McBride, Sebastian Pipping, Sebastian von Ohr, Sergey Serb, Simon Haggett, Simon Newton, Slash Gordon, Stefan Agner, Stefan Tauner, Steinar H. Gunderson, Stephen Groat, Theo Buehler, Thomas Röfer, Tim Hutt, Tim Roberts, Tobias Klauser, Toby Peterson, Tormod Volden, Trygve Laugstøl, Uri Lublin, Uwe Bonnes, Vasily Khoruzhick, Vegard Storheil Eriksen, Venkatesh Shukla, Vianney le Clément de Saint-Marcq, Victor Toso, Vinicius Tinti, Vitali Lovich, Vladimir Beloborodov, William Orr, William Skellenger, Xiaofan Chen, Zhiqiang Liu, Zoltán Kovács, Сергей Валерьевич, Ларионов Даниил, Роман Донченко, liangyunwang, parafin, RipleyTom, saur0n, winterrace