Creative Commons license explained

A Creative Commons (CC) license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted "work". A CC license is used when an author wants to give other people the right to share, use, and build upon a work that the author has created. CC provides an author flexibility (for example, they might choose to allow only non-commercial uses of a given work) and protects the people who use or redistribute an author's work from concerns of copyright infringement as long as they abide by the conditions that are specified in the license by which the author distributes the work.[1] [2] [3] [4] [5]

There are several types of Creative Commons licenses. Each license differs by several combinations that condition the terms of distribution. They were initially released on December 16, 2002, by Creative Commons, a U.S. non-profit corporation founded in 2001. There have also been five versions of the suite of licenses, numbered 1.0 through 4.0.[6] Released in November 2013, the 4.0 license suite is the most current. While the Creative Commons license was originally grounded in the American legal system, there are now several Creative Commons jurisdiction ports which accommodate international laws.

In October 2014, the Open Knowledge Foundation approved the Creative Commons CC BY, CC BY-SA and CC0 licenses as conformant with the "Open Definition" for content and data.[7] [8] [9]

History

Lawrence Lessig and Eric Eldred designed the Creative Commons License (CCL) in 2001 because they saw a need for a license between the existing modes of copyright and public domain status. Version 1.0 of the licenses was officially released on 16 December 2002.[10]

Origins

The CCL allows inventors to keep the rights to their innovations while also allowing for some external use of the invention.[11] The CCL emerged as a reaction to the decision in Eldred v. Ashcroft, in which the United States Supreme Court ruled constitutional provisions of the Copyright Term Extension Act that extended the copyright term of works to be the last living author's lifespan plus an additional 70 years.

License porting

The original non-localized Creative Commons licenses were written with the U.S. legal system in mind; therefore, the wording may be incompatible with local legislation in other jurisdictions, rendering the licenses unenforceable there. To address this issue, Creative Commons asked its affiliates to translate the various licenses to reflect local laws in a process called "porting".[12] As of July 2011, Creative Commons licenses have been ported to over 50 jurisdictions worldwide.[13]

International use

Chinese use

Working with Creative Commons, the Chinese government adapted the Creative Commons License to the Chinese context, replacing the individual monetary compensation of U.S. copyright law with incentives to Chinese innovators to innovate as a social contribution.[14]

Applicable works

Work licensed under a Creative Commons license is governed by applicable copyright law.[15] This allows Creative Commons licenses to be applied to all work falling under copyright, including: books, plays, movies, music, articles, photographs, blogs, and websites.

Software

While software is also governed by copyright law and CC licenses are applicable, the CC recommends against using it in software specifically due to backward-compatibility limitations with existing commonly used software licenses.[16] [17] Instead, developers may resort to use more software-friendly free and open-source software (FOSS) software licenses. Outside the FOSS licensing use case for software there are several usage examples to utilize CC licenses to specify a "Freeware" license model; examples are The White Chamber, Mari0 or Assault Cube.[18] Despite the status of CC0 as the most free copyright license, the Free Software Foundation does not recommend releasing software into the public domain using the CC0 due to patent concerns.

However, application of a Creative Commons license may not modify the rights allowed by fair use or fair dealing or exert restrictions which violate copyright exceptions.[19] Furthermore, Creative Commons licenses are non-exclusive and non-revocable.[20] Any work or copies of the work obtained under a Creative Commons license may continue to be used under that license.[21]

When works are protected by more than one Creative Commons license, the user may choose any of them.[22]

Preconditions

The author, or the licensor in case the author did a contractual transfer of rights, needs to have the exclusive rights on the work. If the work has already been published under a public license, it can be uploaded by any third party, once more on another platform, by using a compatible license, and making reference and attribution to the original license (e.g. by referring to the URL of the original license).

Consequences

The license is non-exclusive, royalty-free, and unrestricted in terms of territory and duration, so it is irrevocable, unless a new license is granted by the author after the work has been significantly modified. Any use of the work that is not covered by other copyright rules triggers the public license. Upon activation of the license, the licensee must adhere to all conditions of the license, otherwise the license agreement is illegitimate, and the licensee would commit a copyright infringement. The author, or the licensor as a proxy, has the legal rights to act upon any copyright infringement. The licensee has a limited period to correct any non-compliance.

Types of licenses

Four rights

The CC licenses all grant "baseline rights", such as the right to distribute the copyrighted work worldwide for non-commercial purposes and without modification.[23] In addition, different versions of license prescribe different rights, as shown in this table:[24]

Icon Right Description
Attribution (BY)Licensees may copy, distribute, display, perform and make derivative works and remixes based on it only if they give the author or licensor the credits (attribution) in the manner specified by these. Since version 2.0, all Creative Commons licenses require attribution to the creator and include the BY element. The letters BY are not an abbreviation, unlike the other rights.
Share-alike (SA)Licensees may distribute derivative works only under a license identical to ("not more restrictive than") the license that governs the original work. (See also Copyleft.) Without share-alike, derivative works might be sublicensed with compatible but more restrictive license clauses, e.g. CC BY to CC BY-NC.
Non-commercial (NC)Licensees may copy, distribute, display, perform the work and make derivative works and remixes based on it only for non-commercial purposes.
No derivative works (ND)Licensees may copy, distribute, display and perform only verbatim copies of the work, not derivative works and remixes based on it. Since version 4.0, derivative works are allowed but must not be shared.

The last two clauses are not free content licenses, according to definitions such as DFSG or the Free Software Foundation's standards, and cannot be used in contexts that require these freedoms, such as Wikipedia. For software, Creative Commons includes three free licenses created by other institutions: the BSD License, the GNU LGPL, and the GNU GPL.[25]

Mixing and matching these conditions produces sixteen possible combinations, of which eleven are valid Creative Commons licenses and five are not. Of the five invalid combinations, four include both the "ND" and "SA" clauses, which are mutually exclusive; and one includes none of the clauses. Of the eleven valid combinations, the five that lack the "BY" clause have been retired because 98% of licensors requested attribution, though they do remain available for reference on the website.[26] [27] [28] This leaves six regularly used licenses plus the CC0 public domain declaration.

Six regularly used licenses

The six licenses in most frequent use are shown in the following table. Among them, those accepted by the Wikimedia Foundation – the public domain dedication and two attribution (BY and BY-SA) licenses – allow the sharing and remixing (creating derivative works), including for commercial use, so long as attribution is given.[29]

License nameAbbreviationIconAttribution requiredAllows remix cultureAllows commercial useAllows Free Cultural WorksMeets the OKF 'Open Definition'
AttributionCC
Attribution-ShareAlikeCC
Attribution-NonCommercialCC
Attribution-NonCommercial-ShareAlikeCC
Attribution-NoDerivativesCC
Attribution-NonCommercial-NoDerivativesCC

Zero, public domain

Besides copyright licenses, Creative Commons also offers CC0, a tool for relinquishing copyright and releasing material into the public domain.[30] CC0 is a legal tool for waiving as many rights as legally possible.[31] Or, when not legally possible, CC0 acts as fallback as public domain equivalent license. Development of CC0 began in 2007[32] and it was released in 2009.[33] [34] A major target of the license was the scientific data community.[35]

In 2010, Creative Commons announced its Public Domain Mark,[36] a tool for labeling works already in the public domain. Together, CC0 and the Public Domain Mark replace the Public Domain Dedication and Certification,[37] which took a U.S.-centric approach and co-mingled distinct operations.

In 2011, the Free Software Foundation added CC0 to its free software licenses. However, the Free Software Foundation currently does not recommend using CC0 to release software into the public domain because it explicitly does not grant a patent license.[38]

In February 2012, CC0 was submitted to Open Source Initiative (OSI) for their approval.[39] However, controversy arose over its clause which excluded from the scope of the license any relevant patents held by the copyright holder. This clause was added for scientific data rather than software, but some members of the OSI believed it could weaken users' defenses against software patents. As a result, Creative Commons withdrew their submission, and the license is not currently approved by the OSI.[40]

From 2013 to 2017, the stock photography website Unsplash used the CC0 license,[41] [42] distributing several million free photos a month.[43] Lawrence Lessig, the founder of Creative Commons, has contributed to the site.[44] Unsplash moved from using the CC0 license to a custom license in June 2017[45] and to an explicitly nonfree license in January 2018.

In October 2014, the Open Knowledge Foundation approved the Creative Commons CC0 as conformant with the Open Definition and recommend the license to dedicate content to the public domain.

In July 2022 Fedora Linux disallowed software licensed under CC0 due to patent rights explicitly not being waived under the license.[46]

Retired licenses

Due to either disuse or criticism, a number of previously offered Creative Commons licenses have since been retired,[47] and are no longer recommended for new works. The retired licenses include all licenses lacking the Attribution element other than CC0, as well as the following four licenses:

Version 4.0

See main article: Creative Commons jurisdiction ports. The latest version 4.0 of the Creative Commons licenses, released on November 25, 2013, are generic licenses that are applicable to most jurisdictions and do not usually require ports.[52] [53] [54] [55] No new ports have been implemented in version 4.0 of the license.[56] Version 4.0 discourages using ported versions and instead acts as a single global license.[57]

Rights and obligations

Attribution

Since 2004, all current licenses other than the CC0 variant require attribution of the original author, as signified by the BY component (as in the preposition "by"). The attribution must be given to "the best of [one's] ability using the information available".[58] Creative Commons suggests the mnemonic "TASL": title – author – source [web link] – [CC] licence.
Generally this implies the following:

Non-commercial licenses

See main article: Creative Commons NonCommercial license. The NonCommercial license allows image creators to restrict selling and profiting from their works by other parties and thus maintaining free of charge access to images.

The "non-commercial" option included in some Creative Commons licenses is controversial in definition,[59] as it is sometimes unclear what can be considered a non-commercial setting, and application, since its restrictions differ from the principles of open content promoted by other permissive licenses.[60] In 2014 Wikimedia Deutschland published a guide to using Creative Commons licenses as wiki pages for translations and as PDF.[61]

Adaptability

Rights in an adaptation can be expressed by a CC license that is compatible with the status or licensing of the original work or works on which the adaptation is based.[62]

Legal aspects

The legal implications of large numbers of works having Creative Commons licensing are difficult to predict, and there is speculation that media creators often lack insight to be able to choose the license which best meets their intent in applying it.[65]

Some works licensed using Creative Commons licenses have been involved in several court cases.[66] Creative Commons itself was not a party to any of these cases; they only involved licensors or licensees of Creative Commons licenses. When the cases went as far as decisions by judges (that is, they were not dismissed for lack of jurisdiction or were not settled privately out of court), they have all validated the legal robustness of Creative Commons public licenses.

Dutch tabloid

In early 2006, podcaster Adam Curry sued a Dutch tabloid who published photos from Curry's Flickr page without Curry's permission. The photos were licensed under the Creative Commons Non-Commercial license. While the verdict was in favor of Curry, the tabloid avoided having to pay restitution to him as long as they did not repeat the offense. Professor Bernt Hugenholtz, main creator of the Dutch CC license and director of the Institute for Information Law of the University of Amsterdam, commented, "The Dutch Court's decision is especially noteworthy because it confirms that the conditions of a Creative Commons license automatically apply to the content licensed under it, and binds users of such content even without expressly agreeing to, or having knowledge of, the conditions of the license."[67] [68] [69] [70]

Virgin Mobile

In 2007, Virgin Mobile Australia launched an advertising campaign promoting their cellphone text messaging service using the work of amateur photographers who uploaded their work to Flickr using a Creative Commons-BY (Attribution) license. Users licensing their images this way freed their work for use by any other entity, as long as the original creator was attributed credit, without any other compensation required. Virgin upheld this single restriction by printing a URL leading to the photographer's Flickr page on each of their ads. However, one picture, depicting 15-year-old Alison Chang at a fund-raising carwash for her church,[71] caused some controversy when she sued Virgin Mobile. The photo was taken by Alison's church youth counselor, Justin Ho-Wee Wong, who uploaded the image to Flickr under the Creative Commons license. In 2008, the case (concerning personality rights rather than copyright as such) was thrown out of a Texas court for lack of jurisdiction.[72] [73]

SGAE vs Fernández

In the fall of 2006, the collecting society Spanish; Castilian: italic=no|Sociedad General de Autores y Editores (SGAE) in Spain sued Ricardo Andrés Utrera Fernández, owner of a disco bar located in Badajoz who played CC-licensed music. SGAE argued that Fernández should pay royalties for public performance of the music between November 2002 and August 2005. The Lower Court rejected the collecting society's claims because the owner of the bar proved that the music he was using was not managed by the society.[74]

In February 2006, the Cultural Association Ladinamo (based in Madrid, and represented by Javier de la Cueva) was granted the use of copyleft music in their public activities. The sentence said:

GateHouse Media, Inc. v. That's Great News, LLC

On June 30, 2010, GateHouse Media filed a lawsuit against That's Great News. GateHouse Media owns a number of local newspapers, including Rockford Register Star, which is based in Rockford, Illinois. That's Great News makes plaques out of newspaper articles and sells them to the people featured in the articles.[75] GateHouse sued That's Great News for copyright infringement and breach of contract. GateHouse claimed that TGN violated the non-commercial and no-derivative works restrictions on GateHouse Creative Commons licensed work when TGN published the material on its website. The case was settled on August 17, 2010, though the settlement was not made public.[76]

Drauglis v. Kappa Map Group, LLC

In 2007, photographer Art Drauglis uploaded several pictures to the photo-sharing website Flickr, giving them the Creative Commons Attribution-ShareAlike 2.0 Generic License (CC BY-SA). One photo, titled "Swain's Lock, Montgomery Co., MD.", was downloaded by Kappa Map Group, a map-making company, and published in 2012 on the front cover of Montgomery Co. Maryland Street Atlas. The text "Photo: Swain's Lock, Montgomery Co., MD Photographer: Carly Lesser & Art Drauglis, Creative Commoms, CC-BY-SA-2.0" was placed on the back cover, but nothing on the front indicated authorship.

The validity of the CC BY-SA 2.0 as a license was not in dispute. The CC BY-SA 2.0 requires that the licensee to use nothing less restrictive than the CC BY-SA 2.0 terms. The atlas was sold commercially and not for free reuse by others. The dispute was whether Drauglis' license terms that would apply to "derivative works" applied to the entire atlas. Drauglis sued the defendants in June 2014 for copyright infringement and license breach, seeking declaratory and injunctive relief, damages, fees, and costs. Drauglis asserted, among other things, that Kappa Map Group "exceeded the scope of the License because defendant did not publish the Atlas under a license with the same or similar terms as those under which the Photograph was originally licensed."[77] The judge dismissed the case on that count, ruling that the atlas was not a derivative work of the photograph in the sense of the license, but rather a collective work. Since the atlas was not a derivative work of the photograph, Kappa Map Group did not need to license the entire atlas under the CC BY-SA 2.0 license. The judge also determined that the work had been properly attributed.[78]

In particular, the judge determined that it was sufficient to credit the author of the photo as prominently as authors of similar authorship (such as the authors of individual maps contained in the book) and that the name "CC-BY-SA-2.0" is sufficiently precise to locate the correct license on the internet and can be considered a valid identifier for the license.[79]

German: Verband zum Schutz geistigen Eigentums im Internet (VGSE)

In July 2016, German computer magazine LinuxUser reported that a German blogger Christoph Langner used two -licensed photographs from Berlin photographer Dennis Skley on his private blog Linuxundich. Langner duly mentioned the author and the license and added a link to the original. Langner was later contacted by the German: Verband zum Schutz geistigen Eigentums im Internet (VGSE) (Association for the Protection of Intellectual Property in the Internet) with a demand for €2300 for failing to provide the full name of the work, the full name of the author, the license text, and a source link, as is required by the fine print in the license. Of this sum, €40 goes to the photographer, and the remainder is retained by VGSE.[80] [81] The Higher Regional Court of Cologne dismissed the claim in May 2019.[82]

Works with a Creative Commons license

See main article: List of major Creative Commons licensed works.

Creative Commons maintains a content directory wiki of organizations and projects using Creative Commons licenses.[83] On its website CC also provides case studies of projects using CC licenses across the world.[84] CC licensed content can also be accessed through a number of content directories and search engines.

Unicode symbols

After being proposed by Creative Commons in 2017,[85] Creative Commons license symbols were added to Unicode with version 13.0 in 2020.[86] The circle with an equal sign (meaning no derivatives) is present in older versions of Unicode, unlike all the other symbols.

NameUnicodeDecimalUTF-8ImageDisplayed
Circled equalsmeaning no derivativesU+229C⊜E2 8A 9C⊜
Circled zero with slashmeaning no rights reservedU+1F10D🄍F0 9F 84 8D
Circled anticlockwise arrowmeaning share alikeU+1F10E🄎F0 9F 84 8E
Circled dollar sign with overlaid backslashmeaning non-commercialU+1F10F🄏F0 9F 84 8F
Circled CCmeaning Creative Commons licenseU+1F16D🅭F0 9F 85 AD
Circled C with overlaid backslashmeaning public domainU+1F16E🅮F0 9F 85 AE
Circled human figuremeaning attribution, creditU+1F16F🅯F0 9F 85 AF

These symbols can be used in succession to indicate a particular Creative Commons license, for example, CC-BY-SA (CC-Attribution-ShareAlike) can be expressed with Unicode symbols CIRCLED CC, CIRCLED HUMAN FIGURE and CIRCLED ANTICLOCKWISE ARROW placed next to each other:

Case law database

In December2020, the Creative Commons organization launched an online database covering licensing case law and legal scholarship.[87] [88]

See also

External links

Notes and References

  1. Web site: Shergill . Sanjeet . 2017-05-06 . The teacher's guide to Creative Commons licenses . dead . https://web.archive.org/web/20180626111219/https://www.openeducationeuropa.eu/en/blogs/teachers-guide-creative-commons-licenses . June 26, 2018 . 2018-03-15 . Open Education Europa.
  2. Web site: June 16, 2015 . What are Creative Commons licenses? . live . https://web.archive.org/web/20180315133811/https://www.wur.nl/en/article/What-are-Creative-Commons-licenses.htm . March 15, 2018 . 2018-03-15 . Wageningen University & Research.
  3. Web site: Creative Commons licenses . live . https://web.archive.org/web/20181121140426/http://guides.lib.umich.edu/creativecommons/licenses . November 21, 2018 . 2018-03-15 . University of Michigan Library.
  4. Web site: Creative Commons licenses . live . https://web.archive.org/web/20180315133739/https://www.gla.ac.uk/media/media_464806_en.pdf . March 15, 2018 . 2018-03-15 . University of Glasgow.
  5. Web site: The Creative Commons licenses . live . https://web.archive.org/web/20180315134320/https://en.unesco.org/open-access/creative-commons-licenses . March 15, 2018 . 2018-03-15 . UNESCO.
  6. Web site: License Versions . live . https://web.archive.org/web/20170630063933/https://wiki.creativecommons.org/wiki/License_Versions . June 30, 2017 . July 4, 2017 . Creative Commons Wiki . mdy-all.
  7. Web site: Open Definition 2.1 . dead . https://web.archive.org/web/20170127074917/http://opendefinition.org/od/2.1/en/ . January 27, 2017 . January 25, 2023 . Open Definition.
  8. Web site: Conformant Licenses . live . https://web.archive.org/web/20160301222106/http://opendefinition.org/licenses/ . March 1, 2016 . January 25, 2023 . Open Definition.
  9. Web site: Vollmer . Timothy . 2013-12-27 . Creative Commons 4.0 BY and BY-SA licenses approved conformant with the Open Definition . https://web.archive.org/web/20160304102501/https://blog.creativecommons.org/2013/12/27/creative-commons-4-0-by-and-by-sa-licenses-approved-conformant-with-the-open-definition/ . 2016-03-04 . 2023-01-25 . Creative Commons . en-US.
  10. Web site: 2002-12-16 . Creative Commons Unveils Machine-Readable Copyright Licenses . Creative Commons . https://web.archive.org/web/20021222175127/http://www.creativecommons.org/press-releases/entry/3476 . December 22, 2002.
  11. Web site: 1.1 The Story of Creative Commons . 2021-04-28 . Creative Commons Certificate for Educators, Academic Librarians and GLAM .
  12. Book: Murray, Laura J. . Putting intellectual property in its place : rights discourses, creative labor, and the everyday . Oxford University Press . 2014 . S. Tina Piper, Kirsty Robertson . 978-0-19-933626-5 . Oxford . 844373100.
  13. "Worldwide". Creative Commons. Archived from the original on October 15, 2008.
  14. Meng . Bingchun . 2009-01-26 . Articulating a Chinese Commons: An Explorative Study of Creative Commons in China . International Journal of Communication . en . 3 . 16 . 1932-8036.
  15. Web site: January 9, 2008 . Creative Commons Legal Code . live . https://web.archive.org/web/20100211175916/http://creativecommons.org/licenses/by/2.5/au/legalcode . February 11, 2010 . February 22, 2010 . . mdy-all.
  16. Web site: July 29, 2013 . Creative Commons FAQ: Can I use a Creative Commons license for software? . live . https://web.archive.org/web/20101127205528/http://wiki.creativecommons.org/FAQ#Can_I_use_a_Creative_Commons_license_for_software.3F . November 27, 2010 . September 20, 2013 . Wiki.creativecommons.org . mdy-all.
  17. Web site: Non-Software Licenses . 2020-11-13 . Choose a License . en.
  18. Web site: AssaultCube – License . live . https://web.archive.org/web/20101225031357/http://assault.cubers.net/docs/license.html . 25 December 2010 . 2011-01-30 . assault.cubers.net . AssaultCube is FREEWARE. [...] The content, code and images of the AssaultCube website and all documentation are licensed under "Attribution-NonCommercial-ShareAlike 3.0 Unported.
  19. Web site: Do Creative Commons licenses affect exceptions and limitations to copyright, such as fair dealing and fair use? . live . https://web.archive.org/web/20150808182345/https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#Do_Creative_Commons_licenses_affect_exceptions_and_limitations_to_copyright.2C_such_as_fair_dealing_and_fair_use.3F . August 8, 2015 . July 26, 2015 . Frequently Asked Questions – Creative Commons . mdy-all.
  20. Web site: What if I change my mind about using a CC license? . live . https://web.archive.org/web/20150808182345/https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#What_if_I_change_my_mind_about_using_a_CC_license.3F . August 8, 2015 . July 26, 2015 . Frequently Asked Questions – Creative Commons . mdy-all.
  21. Web site: What happens if the author decides to revoke the CC license to material I am using? . live . https://web.archive.org/web/20150808182345/https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#What_happens_if_the_author_decides_to_revoke_the_CC_license_to_material_I_am_using.3F . August 8, 2015 . July 26, 2015 . Frequently Asked Questions – Creative Commons . mdy-all.
  22. Web site: How do CC licenses operate? . live . https://web.archive.org/web/20150808182345/https://wiki.creativecommons.org/wiki/Frequently_Asked_Questions#How_do_CC_licenses_operate.3F . August 8, 2015 . July 26, 2015 . Frequently Asked Questions – Creative Commons . mdy-all.
  23. Web site: June 12, 2008 . Baseline Rights . live . https://web.archive.org/web/20100208081209/http://wiki.creativecommons.org/Baseline_Rights . February 8, 2010 . February 22, 2010 . . mdy-all.
  24. Web site: . 28 August 2020 . Frequently Asked Questions . 26 November 2020 . Creative Commons . Creative Commons Corporation.
  25. Web site: Creative Commons GNU LGPL . https://web.archive.org/web/20090622222019/http://creativecommons.org/license/cc-lgpl . June 22, 2009 . July 20, 2009.
  26. Web site: Retired Legal Tools . live . https://web.archive.org/web/20160503224254/https://creativecommons.org/retiredlicenses/ . May 3, 2016 . May 31, 2012 . . mdy.
  27. Web site: May 25, 2004 . Announcing (and explaining) our new 2.0 licenses . live . https://web.archive.org/web/20130921060401/http://creativecommons.org/weblog/entry/4216 . September 21, 2013 . September 20, 2013 . Creativecommons.org . mdy-all.
  28. Web site: About The Licenses – Creative Commons . live . https://web.archive.org/web/20150726003931/http://creativecommons.org/licenses/ . July 26, 2015 . July 26, 2015 . . mdy-all.
  29. Web site: November 16, 2009 . Creative Commons — Attribution 3.0 United States . live . https://web.archive.org/web/20100224022605/http://creativecommons.org/licenses/by/3.0/us/ . February 24, 2010 . February 22, 2010 . . mdy-all.
  30. Web site: CC0 . live . https://web.archive.org/web/20100226071411/http://creativecommons.org/choose/zero . February 26, 2010 . February 22, 2010 . . mdy-all.
  31. Web site: Till . Kreutzer . Validity of the Creative Commons Zero 1.0 Universal Public Domain Dedication and its usability for bibliographic metadata from the perspective of German Copyright Law . live . https://web.archive.org/web/20170525023540/https://www.rd-alliance.org/sites/default/files/cc0-analysis-kreuzer.pdf . May 25, 2017 . July 4, 2017.
  32. Creative Commons Launches CC0 and CC+ Programs . December 17, 2007 . . February 22, 2010 . dead . https://web.archive.org/web/20100223053554/http://creativecommons.org/press-releases/entry/7919 . February 23, 2010 . mdy-all.
  33. Web site: Baker . Gavin . January 16, 2009 . Report from CC board meeting . live . https://web.archive.org/web/20100919010433/http://www.earlham.edu/~peters/fos/2009/01/report-from-cc-board-meeting.html . September 19, 2010 . February 22, 2010 . Open Access News . mdy-all.
  34. Web site: March 11, 2009 . Expanding the Public Domain: Part Zero . live . https://web.archive.org/web/20130921060406/http://creativecommons.org/weblog/entry/13304 . September 21, 2013 . September 20, 2013 . Creativecommons.org . mdy-all.
  35. Web site: Christopher Allan Webber . CC withdrawl [sic] of CC0 from OSI process . https://web.archive.org/web/20150906005825/https://lists.opensource.org/pipermail/license-review/2012-February/000231.html . 2015-09-06 . February 24, 2012 . In the Open Source Initiative Licence review mailing list.
  36. Web site: August 10, 2010 . Marking and Tagging the Public Domain: An Invitation to Comment . live . https://web.archive.org/web/20130921060643/http://creativecommons.org/weblog/entry/22940 . September 21, 2013 . September 20, 2013 . Creativecommons.org . mdy-all.
  37. Web site: August 20, 2009 . Copyright-Only Dedication (based on United States law) or Public Domain Certification . live . https://web.archive.org/web/20100223035835/http://creativecommons.org/licenses/publicdomain/ . February 23, 2010 . February 22, 2010 . . mdy-all.
  38. Web site: Various Licenses and Comments about Them . live . https://web.archive.org/web/20100724023833/https://www.gnu.org/licenses/license-list.html . July 24, 2010 . April 4, 2015 . . mdy-all.
  39. Web site: Carl Boettiger . OSI recognition for Creative Commons Zero License? . live . https://web.archive.org/web/20130926193810/http://projects.opensource.org/pipermail/license-review/2012-February/ . September 26, 2013 . February 1, 2012 . In the Open Source Initiative Licence review mailing list . Open Source Initiative . mdy-all.
  40. Web site: The Open Source Initiative FAQ . What about the Creative Commons "CC0" ("CC Zero") public domain dedication? Is that Open Source? . October 21, 2007 . live . https://web.archive.org/web/20130519153636/http://opensource.org/faq#cc-zero . May 19, 2013 . May 25, 2013 . Open Source Initiative . mdy-all.
  41. Web site: August 14, 2013 . Unsplash is a site full of free images for your next splash page . live . https://web.archive.org/web/20151117024732/http://thenextweb.com/entrepreneur/2013/08/14/unsplash-is-a-site-full-of-images-you-can-use-freely-for-your-next-startups-splash-page/ . November 17, 2015 . 2015-11-13 . The Next Web . en-US . mdy-all.
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  43. Web site: February 18, 2015 . Why Building Something Useful For Others Is The Best Marketing There Is . live . https://web.archive.org/web/20151114225726/http://www.fastcompany.com/3042417/how-i-get-it-done/why-building-something-useful-for-others-is-the-best-marketing-there-is . November 14, 2015 . 2015-11-13 . Fast Company . en-US . mdy-all.
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  50. Web site: November 13, 2009 . Sampling Plus 1.0 . live . https://web.archive.org/web/20120411100732/http://creativecommons.org/licenses/sampling+/1.0/ . April 11, 2012 . April 9, 2012 . . mdy-all.
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  52. Web site: Peters . Diane . November 25, 2013 . CC's Next Generation Licenses — Welcome Version 4.0! . live . https://web.archive.org/web/20131126124736/http://creativecommons.org/weblog/entry/40768 . November 26, 2013 . November 26, 2013 . Creative Commons . mdy-all.
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  61. Book: Till Kreutzer . Open Content – A Practical Guide to Using Creative Commons Licenses . Wikimedia Deutschland e.a. . 2014 . 978-3-940785-57-2 . March 23, 2015 . https://web.archive.org/web/20150404014103/https://commons.wikimedia.org/wiki/File:Open_Content_A_Practical_Guide_to_Using_Creative_Commons_Licences_web.pdf . April 4, 2015 . live . mdy-all.
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  64. Creative Commons licenses without a non-commercial or no-derivatives requirement, including public domain/CC0, are all cross-compatible. Non-commercial licenses are compatible with each other and with less restrictive licenses, except for Attribution-ShareAlike. No-derivatives licenses are not compatible with any license, including themselves.
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  77. Web site: August 18, 2015 . Memorandum Opinion . live . https://web.archive.org/web/20160921202242/https://www.gpo.gov/fdsys/pkg/USCOURTS-dcd-1_14-cv-01043/pdf/USCOURTS-dcd-1_14-cv-01043-0.pdf . September 21, 2016 . August 29, 2016 . United States District Court for the District of Columbia . mdy-all.
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  79. Web site: Michael W. Carroll . Michael W. . Carroll . Carrollogos: U.S. Court Correctly Interprets Creative Commons Licenses . live . https://web.archive.org/web/20171002120451/https://carrollogos.blogspot.com/2016/04/us-court-correctly-interprets-creative.html . October 2, 2017 . 2017-10-02 . mdy-all.
  80. Luther . Jörg . July 2016 . Kleingedrucktes – Editorial . Fine print – Editorial . live . . de . 1615-4444 . https://web.archive.org/web/20160915150620/http://www.linux-community.de/Internal/Artikel/Print-Artikel/LinuxUser/2016/07/Kleingedrucktes . September 15, 2016 . 2016-09-09 . 7/2016 . mdy-all.
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  82. Web site: 22 May 2019 . Creative Commons-Foto-Abmahnung: Rasch Rechtsanwälte setzen erfolgreich Gegenansprüche durch . Creative Commons photo notice: Rasch attorneys successfully enforce counterclaims . live . https://web.archive.org/web/20191219023851/https://www.anwalt.de/rechtstipps/creative-commons-foto-abmahnung-rasch-rechtsanwaelte-setzen-erfolgreich-gegenansprueche-durch_155491.html . December 19, 2019 . 18 December 2019 . anwalt.de . de.
  83. Web site: Content Directories . live . https://web.archive.org/web/20090430010815/http://wiki.creativecommons.org/Content_Directories . April 30, 2009 . April 24, 2009 . creativecommons.org . mdy-all.
  84. Web site: Case Studies . live . https://web.archive.org/web/20111224111652/http://wiki.creativecommons.org/Casestudies . December 24, 2011 . December 20, 2011 . Creative Commons . mdy-all.
  85. Web site: 2017-07-24 . Proposal to add CC license symbols to UCS . 2020-08-21 . Unicode.
  86. Web site: Steuer . Eric . 2020-03-18 . The Unicode Standard Now Includes CC License Symbols . live . https://web.archive.org/web/20200727183045/https://creativecommons.org/2020/03/18/the-unicode-standard-now-includes-cc-license-symbols/ . 2020-07-27 . 2020-07-06 . Creative Commons . en-US.
  87. Web site: Salazar . Krystle . 3 December 2020 . Explore the new CC legal database site! . 2021-01-03 . Creative Commons . Mountain View, California, US.
  88. Web site: Creative Commons . Creative Commons Legal Database . 2021-01-03 . Creative Commons . Mountain View, California, US.

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