Copyleft (English Wikipedia)

Philip Wood; Amy Ryburn; Allan Yeoman; Andrew Matangi; Steve Nightingale (1 July 2013). "Legal update on Information and Communication Technology – July 2013". Archived from the original on 21 September 2013. Retrieved 10 June 2016.

catb.org (Global: 3,959^th place; English: 3,208^th place)

Raymond, Eric Steven (9 November 2002). "Licensing HOWTO". Retrieved 23 August 2008.
"General Public Virus". Jargon File 2.2.1. 15 December 1990. Retrieved 29 April 2007.
Raymond, Eric Steven (9 November 2002). "Licensing HOWTO". Retrieved 21 March 2010.

cnet.com (Global: 272^nd place; English: 225^th place)

news.cnet.com

"Microsoft license spurns open source". CNET. CBS Interactive.

cnet.com

MacCrisken, Jack. "Open source: One agnostic's view". CNET. Retrieved 5 July 2025.

compart.com (Global: low place; English: low place)

"Unicode Character "🄯" (U+1F12F)". www.compart.com. Retrieved 12 September 2024.

creativecommons.org (Global: 1,010^th place; English: 612^th place)

"Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)". Creative Commons. Retrieved 14 August 2015.

devlinux.org (Global: low place; English: low place)

Hackvän, Stig (September 1999). "Reverse-engineering the GNU Public Virus – Is copyleft too much of a good thing?". Linux Journal. Archived from the original on 18 July 2011. Retrieved 29 April 2007.

doi.org (Global: 2^nd place; English: 2^nd place)

Newman, John (29 December 2011). "Copyright and Open Access at the Bedside". NEJM. 365 (26): 2447–2449. doi:10.1056/NEJMp1110652. PMID 22204721.
Carver, Brian W. (5 April 2005). "Share and Share Alike: Understanding and Enforcing Open Source and Free Software Licenses". Berkeley Technology Law Journal. 20 (1): 443. doi:10.15779/Z388T19. S2CID 153900462. SSRN 1586574. Retrieved 27 June 2023.
Engelfriet, Arnoud (2010). "Choosing an Open Source License". IEEE Software. 27. Athens University of Economics and Business: 48–49. doi:10.1109/MS.2010.5. S2CID 36712745.

europa.eu (Global: 68^th place; English: 117^th place)

joinup.ec.europa.eu

Patrice-Emmanuel Schmitz (3 April 2015). "The meaning of "Copyleft" in EUPL". Joinup.

free-soft.org (Global: low place; English: low place)

"Emacs General Public License". 5 July 2001. Retrieved 23 August 2008.

freshmeat.net (Global: low place; English: low place)

themes.freshmeat.net

Griffis, L. Adrian (15 July 2000). "The GNU Public Virus". Archived from the original on 9 November 2017. Retrieved 29 April 2007.

friedfrank.com (Global: low place; English: low place)

Jason Greenberg; Daniel Glazer (March 2013). "Inoculating Your Purchase – Contractual Protection from Viral Licenses in M&A Transactions" (PDF). Fried Frank. Association of Corporate Counsel. Retrieved 10 June 2016.

gnu.org (Global: 1,475^th place; English: 1,188^th place)

gnu.org

Stallman, Richard (29 June 2007). "GNU General Public License". GNU Project. Retrieved 1 May 2017.
Stallman, Richard (21 January 2008). "About the GNU Project". Free Software Foundation. Retrieved 1 May 2017.
"Licenses". GNU Project. Retrieved 6 October 2021.: "We don't take the position that artistic or entertainment works must be free, but if you want to make one free, we recommend the Free Art License."
"What is free software?". GNU. 30 July 2019. Retrieved 22 July 2020.
"How to choose a license for your own work". Free Software Foundation's Licensing and Compliance Lab. Retrieved 1 May 2017.
"What is Copyleft?". GNU Project.
For some of the philosophy behind the term "SaaSS", see the "Server Software" section of "How to choose a license for your own work". GNU Project. 20 December 2015. Retrieved 1 May 2017.
Stallman, Richard (18 November 2016). "Who does that server really serve?". GNU Project. Retrieved 1 May 2017.
"Why the Affero GPL". GNU Project. 10 May 2015. Retrieved 1 May 2017.
List of free-software licences on the GNU website: "We recommend that developers consider using the GNU AGPL for any software which will commonly be run over a network".
"Various Licenses and Comments about Them - Sybase Open Watcom Public License version 1.0 (#Watcom)". GNU. Retrieved 23 December 2015. This is not a free software license. It requires you to publish the source code publicly whenever you "Deploy" the covered software, and "Deploy" is defined to include many kinds of private use.
"Various Licenses and Comments about Them". GNU Project.
"Frequently Asked Questions about the GNU Licenses". Free Software Foundation. 24 June 2008. Retrieved 1 May 2017.
Stallman, Richard. "Why you shouldn't use the Lesser GPL for your next library". GNU Project.

gcc.gnu.org

Buck, Joe (10 October 2000). "Re: Using of parse tree externally". GCC mailing list. Retrieved 29 April 2007.

harvard.edu (Global: 18^th place; English: 17^th place)

ui.adsabs.harvard.edu

Hall, G. Brent (2008). Open Source Approaches in Spatial Data Handling. Springer. p. 29. Bibcode:2008osas.book.....H. ISBN 9783540748311.

inet-tr.org.tr (Global: low place; English: low place)

cyberinet05.inet-tr.org.tr

Mustonen, Mikko. "Copyleft - The Economics of Linux and Other Open Source Software" (PDF). Information Economics and Policy. Archived from the original (PDF) on 2 May 2014. Retrieved 1 May 2014.

inria.fr (Global: 4,903^rd place; English: 3,679^th place)

"Free Software Licensing Agreement CeCILL" (PDF). INRIA. Archived from the original (PDF) on 8 August 2010. Retrieved 24 August 2010.

iplj.net (Global: low place; English: low place)

Maher, Marcus (2000). "Open Source Software: The Success of an Alternative Intellectual Property Incentive Paradigm" (PDF). Fordham Intellectual Property, Media & Entertainment Law Journal. Archived from the original (PDF) on 2 May 2014. Retrieved 1 May 2014.

linuxtoday.com (Global: low place; English: low place)

Byfield, Bruce (29 August 2006). "IT Manager's Journal: 10 Common Misunderstandings About the GPL". Retrieved 23 August 2008.

lu.is (Global: low place; English: low place)

"The license term smorgasbord: copyleft, share-alike, reciprocal, viral, or hereditary?". Luis Villa: Open Law and Strategy. 3 February 2012. Retrieved 22 August 2018.

lwn.net (Global: 4,423^rd place; English: 2,925^th place)

Stallman, Richard (26 February 2001). "LWN.net: RMS on the Ogg Vorbis license". Retrieved 23 August 2008. [M]y agreement with the idea of a lax [Ogg/Vorbis] license in this special case is just as pragmatic as my preference for the GPL in most cases. In both cases it is a matter of how we can attain freedom.

microsoft.com (Global: 153^rd place; English: 151^st place)

Mundie, Craig (3 May 2001). "Prepared Text of Remarks by Craig Mundie, Microsoft Senior Vice President – The Commercial Software Model". New York University Stern School of Business. Archived from the original on 21 June 2005. Retrieved 1 October 2009.
Mundie, Craig (3 May 2001). "Speech Transcript – Craig Mundie". New York University Stern School of Business. Archived from the original on 21 June 2005. Retrieved 23 August 2008.

nih.gov (Global: 4^th place; English: 4^th place)

pubmed.ncbi.nlm.nih.gov

Newman, John (29 December 2011). "Copyright and Open Access at the Bedside". NEJM. 365 (26): 2447–2449. doi:10.1056/NEJMp1110652. PMID 22204721.

nytimes.com (Global: 7^th place; English: 7^th place)

The New York Times. Retrieved 23 April 2022

onlamp.com (Global: low place; English: low place)

Biancuzzi, Federico (30 June 2005). "ESR: "We Don't Need the GPL Anymore"". ONLamp.com. Archived from the original on 6 March 2018. Retrieved 23 August 2008.

opensource.org (Global: low place; English: low place)

Tiemann, Michael (18 September 2006). "Licenses by Name". Retrieved 23 August 2008.

oreilly.com (Global: 4,347^th place; English: 3,017^th place)

Williams, Sam (March 2002). "7". Free as in Freedom – Richard Stallman's Crusade for Free Software. O'Reilly Media. ISBN 978-0-596-00287-9.

osor.eu (Global: low place; English: low place)

"The EUPL – European Union Public Licence". European Commission. Retrieved 9 January 2007.

pcworld.com (Global: 1,317^th place; English: 873^rd place)

"Wikipedia Drops GNU in Favor of Creative Commons License". PC world. 21 May 2009. Retrieved 4 July 2025.

psg.com (Global: low place; English: low place)

Vixie, Paul (6 March 2006). "Re: Section 5.2 (IPR encumberance) in TAK rollover requirement draft". IETF Namedroppers mailing list. Archived from the original on 27 September 2007. Retrieved 29 April 2007.

redhat.com (Global: 5,386^th place; English: 4,042^nd place)

Troan, Larry (2006). Open Source from a Proprietary Perspective (PDF). Red Hat Summit. Nashville: Red Hat. Archived from the original (PDF) on 22 January 2014.

semanticscholar.org (Global: 11^th place; English: 8^th place)

api.semanticscholar.org

Carver, Brian W. (5 April 2005). "Share and Share Alike: Understanding and Enforcing Open Source and Free Software Licenses". Berkeley Technology Law Journal. 20 (1): 443. doi:10.15779/Z388T19. S2CID 153900462. SSRN 1586574. Retrieved 27 June 2023.
Engelfriet, Arnoud (2010). "Choosing an Open Source License". IEEE Software. 27. Athens University of Economics and Business: 48–49. doi:10.1109/MS.2010.5. S2CID 36712745.

slashdot.org (Global: 5,701^st place; English: 4,384^th place)

yro.slashdot.org

"What the GPLv3 Means for MS-Novell Agreement". Yro.slashdot.org. 8 March 2007. Retrieved 14 May 2014.

ssrn.com (Global: 703^rd place; English: 501^st place)

papers.ssrn.com

Carver, Brian W. (5 April 2005). "Share and Share Alike: Understanding and Enforcing Open Source and Free Software Licenses". Berkeley Technology Law Journal. 20 (1): 443. doi:10.15779/Z388T19. S2CID 153900462. SSRN 1586574. Retrieved 27 June 2023.

suntimes.com (Global: 327^th place; English: 228^th place)

Newbart, Dave (1 June 2001). "Microsoft CEO takes launch break with the Sun-Times". Chicago Sun-Times. Archived from the original on 15 June 2001.(Internet archive link)

unicode.org (Global: 311^th place; English: 239^th place)

unicode.org

"The Unicode Standard, Version 15.0: Enclosed Alphanumeric Supplement" (PDF). unicode.org.
"Proposal to add the Copyleft Symbol to Unicode" (PDF).
"Proposed New Characters: Pipeline Table". Unicode Character Proposals. Unicode Consortium. Retrieved 18 April 2017.

blog.unicode.org

"Announcing The Unicode Standard, Version 11.0". The Unicode Blog. Retrieved 6 June 2018.

venona.com (Global: low place; English: low place)

cypherpunks.venona.com

Stewart, Bill (8 October 1998). "Re: propose: 'cypherpunks license' (Re: Wanted: Twofish source code)". Cypherpunks mailing list. Archived from the original on 29 May 2007. Retrieved 29 April 2007.

web.archive.org (Global: 1^st place; English: 1^st place)

Troan, Larry (2006). Open Source from a Proprietary Perspective (PDF). Red Hat Summit. Nashville: Red Hat. Archived from the original (PDF) on 22 January 2014.
Mundie, Craig (3 May 2001). "Prepared Text of Remarks by Craig Mundie, Microsoft Senior Vice President – The Commercial Software Model". New York University Stern School of Business. Archived from the original on 21 June 2005. Retrieved 1 October 2009.
Maher, Marcus (2000). "Open Source Software: The Success of an Alternative Intellectual Property Incentive Paradigm" (PDF). Fordham Intellectual Property, Media & Entertainment Law Journal. Archived from the original (PDF) on 2 May 2014. Retrieved 1 May 2014.
Mustonen, Mikko. "Copyleft - The Economics of Linux and Other Open Source Software" (PDF). Information Economics and Policy. Archived from the original (PDF) on 2 May 2014. Retrieved 1 May 2014.
"Free Software Licensing Agreement CeCILL" (PDF). INRIA. Archived from the original (PDF) on 8 August 2010. Retrieved 24 August 2010.
Biancuzzi, Federico (30 June 2005). "ESR: "We Don't Need the GPL Anymore"". ONLamp.com. Archived from the original on 6 March 2018. Retrieved 23 August 2008.
"Glossary". a2knetwork.org. Archived from the original on 26 April 2009.
Philip Wood; Amy Ryburn; Allan Yeoman; Andrew Matangi; Steve Nightingale (1 July 2013). "Legal update on Information and Communication Technology – July 2013". Archived from the original on 21 September 2013. Retrieved 10 June 2016.
Vixie, Paul (6 March 2006). "Re: Section 5.2 (IPR encumberance) in TAK rollover requirement draft". IETF Namedroppers mailing list. Archived from the original on 27 September 2007. Retrieved 29 April 2007.
Hackvän, Stig (September 1999). "Reverse-engineering the GNU Public Virus – Is copyleft too much of a good thing?". Linux Journal. Archived from the original on 18 July 2011. Retrieved 29 April 2007.
Stewart, Bill (8 October 1998). "Re: propose: 'cypherpunks license' (Re: Wanted: Twofish source code)". Cypherpunks mailing list. Archived from the original on 29 May 2007. Retrieved 29 April 2007.
Griffis, L. Adrian (15 July 2000). "The GNU Public Virus". Archived from the original on 9 November 2017. Retrieved 29 April 2007.
Mundie, Craig (3 May 2001). "Speech Transcript – Craig Mundie". New York University Stern School of Business. Archived from the original on 21 June 2005. Retrieved 23 August 2008.
Newbart, Dave (1 June 2001). "Microsoft CEO takes launch break with the Sun-Times". Chicago Sun-Times. Archived from the original on 15 June 2001.(Internet archive link)

Copyleft (English Wikipedia)

a2knetwork.org (Global: low place; English: low place)

analyticsindiamag.com (Global: low place; English: 7,637th place)

archive.org (Global: 6th place; English: 6th place)

artlibre.org (Global: low place; English: low place)

austlii.edu.au (Global: 1,812th place; English: 995th place)

classic.austlii.edu.au

berkeley.edu (Global: 580th place; English: 462nd place)

lawcat.berkeley.edu

books.google.com (Global: 3rd place; English: 3rd place)

buddlefindlay.com (Global: low place; English: low place)

catb.org (Global: 3,959th place; English: 3,208th place)

cnet.com (Global: 272nd place; English: 225th place)

news.cnet.com

cnet.com

compart.com (Global: low place; English: low place)

creativecommons.org (Global: 1,010th place; English: 612th place)

devlinux.org (Global: low place; English: low place)

doi.org (Global: 2nd place; English: 2nd place)

europa.eu (Global: 68th place; English: 117th place)

joinup.ec.europa.eu

free-soft.org (Global: low place; English: low place)

freshmeat.net (Global: low place; English: low place)

themes.freshmeat.net

friedfrank.com (Global: low place; English: low place)

gnu.org (Global: 1,475th place; English: 1,188th place)

gnu.org

gcc.gnu.org

harvard.edu (Global: 18th place; English: 17th place)

ui.adsabs.harvard.edu

inet-tr.org.tr (Global: low place; English: low place)

cyberinet05.inet-tr.org.tr

inria.fr (Global: 4,903rd place; English: 3,679th place)

iplj.net (Global: low place; English: low place)

linuxtoday.com (Global: low place; English: low place)

lu.is (Global: low place; English: low place)

lwn.net (Global: 4,423rd place; English: 2,925th place)

microsoft.com (Global: 153rd place; English: 151st place)

nih.gov (Global: 4th place; English: 4th place)

pubmed.ncbi.nlm.nih.gov

nytimes.com (Global: 7th place; English: 7th place)

onlamp.com (Global: low place; English: low place)

opensource.org (Global: low place; English: low place)

oreilly.com (Global: 4,347th place; English: 3,017th place)

osor.eu (Global: low place; English: low place)

pcworld.com (Global: 1,317th place; English: 873rd place)

psg.com (Global: low place; English: low place)

redhat.com (Global: 5,386th place; English: 4,042nd place)

semanticscholar.org (Global: 11th place; English: 8th place)

api.semanticscholar.org

slashdot.org (Global: 5,701st place; English: 4,384th place)

yro.slashdot.org

ssrn.com (Global: 703rd place; English: 501st place)

papers.ssrn.com

suntimes.com (Global: 327th place; English: 228th place)

unicode.org (Global: 311th place; English: 239th place)

unicode.org

blog.unicode.org

venona.com (Global: low place; English: low place)

cypherpunks.venona.com

web.archive.org (Global: 1st place; English: 1st place)

wikisource.org (Global: 27th place; English: 51st place)

en.wikisource.org

wired.co.uk (Global: 2,053rd place; English: 1,340th place)

analyticsindiamag.com (Global: low place; English: 7,637^th place)

archive.org (Global: 6^th place; English: 6^th place)

austlii.edu.au (Global: 1,812^th place; English: 995^th place)

berkeley.edu (Global: 580^th place; English: 462^nd place)

books.google.com (Global: 3^rd place; English: 3^rd place)

catb.org (Global: 3,959^th place; English: 3,208^th place)

cnet.com (Global: 272^nd place; English: 225^th place)

creativecommons.org (Global: 1,010^th place; English: 612^th place)

doi.org (Global: 2^nd place; English: 2^nd place)

europa.eu (Global: 68^th place; English: 117^th place)

gnu.org (Global: 1,475^th place; English: 1,188^th place)

harvard.edu (Global: 18^th place; English: 17^th place)

inria.fr (Global: 4,903^rd place; English: 3,679^th place)

lwn.net (Global: 4,423^rd place; English: 2,925^th place)

microsoft.com (Global: 153^rd place; English: 151^st place)

nih.gov (Global: 4^th place; English: 4^th place)

nytimes.com (Global: 7^th place; English: 7^th place)

oreilly.com (Global: 4,347^th place; English: 3,017^th place)

pcworld.com (Global: 1,317^th place; English: 873^rd place)

redhat.com (Global: 5,386^th place; English: 4,042^nd place)

semanticscholar.org (Global: 11^th place; English: 8^th place)

slashdot.org (Global: 5,701^st place; English: 4,384^th place)

ssrn.com (Global: 703^rd place; English: 501^st place)

suntimes.com (Global: 327^th place; English: 228^th place)

unicode.org (Global: 311^th place; English: 239^th place)

web.archive.org (Global: 1^st place; English: 1^st place)

wikisource.org (Global: 27^th place; English: 51^st place)

wired.co.uk (Global: 2,053^rd place; English: 1,340^th place)