Creative Commons license

This article is about the Creative Commons licences. For the organization that produced them, see Creative Commons.

Creative Commons logo
This video explains how Creative Commons licenses can be used in conjunction with commercial licensing arrangements.
Creative Commons licenses are explained in many languages and used around the world, such as pictured here in Cambodia.

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 people the right to share, use, and build upon a work that they have created. CC provides an author flexibility (for example, they might choose to allow only non-commercial uses of their own 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.

CC licensed music is available through several outlets such as SoundCloud, and are available for use in video and music remixing.

There are several types of CC licenses. The licenses differ 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.

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.[1][2][3]

Applicable works

Work licensed under a Creative Commons license is governed by applicable copyright law.[4] This allows Creative Commons licenses to be applied to all work falling under copyright, including: books, plays, movies, music, articles, photographs, blogs, and websites. Creative Commons does not recommend the use of Creative Commons licenses for software.[5]

There are over 35,000 works that are available in hardcopy and have a registered ISBN number. Creative Commons splits these works into two categories, one of which encompasses self-published books.[6]

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.[7] Furthermore, Creative Commons licenses are non-exclusive and non-revocable.[8] Any work or copies of the work obtained under a Creative Commons license may continue to be used under that license.[9]

In the case of works protected by multiple Creative Common licenses, the user may choose either.[10]

Types of licenses

Wanna Work Together? animation by Creative Commons
The second version of the Mayer and Bettle promotional animation explains what Creative Commons is.
Creative commons license spectrum between public domain (top) and all rights reserved (bottom). Left side indicates the use-cases allowed, right side the license components. The dark green area indicates Free Cultural Works compatible licenses, the two green areas compatibility with the Remix culture.
CC license usage in 2014 (top and middle), "Free cultural works" compatible license usage 2010 to 2014 (bottom).

The CC licenses all grant the "baseline rights", such as the right to distribute the copyrighted work worldwide for non-commercial purposes, and without modification.[11] The details of each of these licenses depend on the version, and comprises a selection out of four conditions:

{| class="wikitable"

|- ! Icon !! Right || Description |- | | Attribution (BY) | Licensees may copy, distribute, display and perform the work 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. |- | | Share-alike (SA) | Licensees may distribute derivative works only under a license identical ("not more restrictive") to 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, and 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. |} [12]

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.[13]

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.[14][15][16] This leaves six regularly used licenses + the CC0 public domain waiver:

Seven regularly used licenses

{| class="wikitable sortable"

|- ! Icon !! Description !! Acronym !!Free Cultural Works!!Remix culture!!Commercial use |- | CC0 icon || Freeing content globally without restrictions || CC0|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes || style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes |- | CC-BY icon || Attribution alone || BY||style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes |- | CC-BY-SA icon || Attribution + ShareAlike || BY-SA||style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes||style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes |- | CC-by-NC icon || Attribution + Noncommercial || BY-NC||style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No |- | CC-BY-ND icon || Attribution + NoDerivatives || BY-ND||style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes |- | CC-BY-NC-SA icon || Attribution + Noncommercial + ShareAlike || BY-NC-SA||style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#9F9;vertical-align:middle;text-align:center;" class="table-yes"|Yes|| style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No |- | CC-BY-NC-ND icon || Attribution + Noncommercial + NoDerivatives || BY-NC-ND||style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No|| style="background:#F99;vertical-align:middle;text-align:center;" class="table-no"|No |} [16][17]

For example, the Creative Commons Attribution (BY) license allows one to share and remix (create derivative works), even for commercial use, so long as attribution is given.[18]

Version 4.0 and international use

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."[19] As of July 2011, Creative Commons licenses have been ported to over 50 jurisdictions worldwide.[20]

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.[21][22][23][24] No new ports have been implemented in version 4.0 of the license.[25] Version 4.0 discourages using ported versions and instead acts as a single global license.[26]

Rights

Attribution

Since 2004, all current licenses (beside the CC0 waiver) require attribution of the original author, the BY component.[15] The attribution must be given to "the best of [one's] ability using the information available".[27] Generally this implies the following:

Non-commercial licenses

The "non-commercial" option included in some Creative Commons licenses is controversial in definition,[28] 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.[29] In 2014 Wikimedia published a guide to using Creative Commons licences as wiki pages for translations and as PDF.[30]

Zero / public domain

CC zero waiver/license logo.[31]
Creative Commons Public Domain Mark. Indicates works which have already fallen or were given into PD.

Besides licenses, Creative Commons also offers a way to release material worldwide into the public domain through CC0,[17] a legal tool for waiving as many rights as legally possible.[32] Development of CC0 began in 2007[33] and the tool was released in 2009.[34][35] A major target of the license was the scientific data community.[36]

In 2010, Creative Commons announced its Public Domain Mark,[37] a tool for labeling works already in the public domain. Together, CC0 and the Public Domain Mark replace the Public Domain Dedication and Certification,[38] 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,[39] and currently recommends CC0 as the preferred method of releasing software into the public domain.[40]

In February 2012 CC0 was submitted to Open Source Initiative (OSI) for their approval.[41] 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 with scientific data in mind 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.[36][42]

In 2013, Unsplash began using the CC0 license to distribute free stock photography.[43][44] It now distributes several million photos a month[45] and has inspired a host of similar sites, including CC0 photography companies and CC0 blogging companies.[46] Lawrence Lessig, the founder of Creative Commons, has contributed to the site.[47]

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.[2][3]

Adaptation

A license compatibility chart for combining or mixing two CC licensed works.

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.[48]

Legal aspects

The legal implications of large numbers of works having Creative Commons licensing is 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.[49]

Some works licensed using Creative Commons licenses have been involved in several court cases.[50] 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. Here are some notable cases:

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 bind users of such content even without expressly agreeing to, or having knowledge of, the conditions of the license."[51][52][53][54]

Virgin Mobile

In 2007, Virgin Mobile Australia launched an Australian bus stop ad 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,[55] 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.[55] In 2008, the case (concerning personality rights rather than copyright as such) was thrown out of a Texas court for lack of jurisdiction.[56][57]

SGAE vs Fernández

In the fall of 2006, the collecting society 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.[58]

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: "Admitting the existence of music equipment, a joint evaluation of the evidence practiced this court is convinced that the defendant prevents communication of works whose management is entrusted to the plaintiff [SGAE], using a repertoire of authors who have not assigned the exploitation of their rights to the SGAE, having at its disposal a database for that purpose and so it is manifested both by the legal representative of the Association and by Manuela Villa Acosta, in charge of the cultural programming of the association, which is compatible with the alternative character of the Association and its integration in the movement called "copy left".[59]

GateHouse Media, Inc. vs. 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.[60] 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.[60][61]

Drauglis v. Kappa Map Group, LLC

The plaintiff was photographer Art Drauglis, who uploaded several pictures to the photo-sharing website Flickr using Creative Commons Attribution-ShareAlike 2.0 Generic License (CC BY-SA), including one entitled "Swain's Lock, Montgomery Co., MD.". The defendant was Kappa Map Group, a map-making company, which downloaded the image and used it in a compilation entitled "Montgomery Co. Maryland Street Atlas". Though there was nothing in the cover that indicated the origin of the picture, the text "Photo: Swain's Lock, Montgomery Co., MD Photographer: Carly Lesser & Art Drauglis, Creative Commoms [sic], CC-BY-SA-2.0" appeared at the bottom of the back cover.

The atlas was sold commercially, and while the author had released it under a license that allows commercial use, he came to object to the use of the picture in this manner, suffering what is known as "licensor remorse". Drauglis sued the defendants on June 2014 for copyright infringement and license breach, seeking declaratory and injunctive relief, damages, fees, and costs. The judge dismissed the case on both counts, claiming that the Atlas was not a derivative work in the sense of the licence, and therefore it did not breach the share-alike elements. The judge also determined that the work had been properly attributed.[62]

Works with a Creative Commons license

Number of Creative Commons licensed works as of 2014, per State of the Commons report

Creative Commons maintains a content directory wiki of organizations and projects using Creative Commons licenses.[63] On its website CC also provides case studies of projects using CC licenses across the world.[64] CC licensed content can also be accessed through a number of content directories and search engines (see CC licensed content directories).

Retired licenses

Due to either disuse or criticism, a number of previously offered Creative Commons licenses have since been retired,[14][65] 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:

See also

References

  1. ↑ Open Definition 2.1 on opendefinition.org
  2. 1 2 licenses on opendefinition.com
  3. 1 2 Creative Commons 4.0 BY and BY-SA licenses approved conformant with the Open Definition by Timothy Vollmer on creativecommons.org (December 27th, 2013)
  4. ↑ "Creative Commons Legal Code". Creative Commons. January 9, 2008. Retrieved February 22, 2010.
  5. ↑ "Creative Commons FAQ: Can I use a Creative Commons license for software?". Wiki.creativecommons.org. July 29, 2013. Retrieved September 20, 2013.
  6. ↑ "Books - Creative Commons". wiki.creativecommons.org. Retrieved 2016-04-01.
  7. ↑ "Do Creative Commons licenses affect exceptions and limitations to copyright, such as fair dealing and fair use?". Frequently Asked Questions - Creative Commons. Retrieved July 26, 2015.
  8. ↑ "What if I change my mind about using a CC license?". Frequently Asked Questions - Creative Commons. Retrieved July 26, 2015.
  9. ↑ "What happens if the author decides to revoke the CC license to material I am using?". Frequently Asked Questions - Creative Commons. Retrieved July 26, 2015.
  10. ↑ "How do CC licenses operate?". Frequently Asked Questions - Creative Commons. Retrieved July 26, 2015.
  11. ↑ "Baseline Rights". Creative Commons. June 12, 2008. Retrieved February 22, 2010.
  12. ↑ "What are Creative Commons licenses?". Frequently Asked Questions - Creative Commons. Retrieved July 26, 2015.
  13. ↑ "Creative Commons GNU LGPL". Archived from the original on June 22, 2009. Retrieved July 20, 2009.
  14. 1 2 "Retired Legal Tools". Creative Commons. Retrieved May 31, 2012.
  15. 1 2 "Announcing (and explaining) our new 2.0 licenses". Creativecommons.org. May 25, 2004. Retrieved September 20, 2013.
  16. 1 2 "About The Licenses - Creative Commons". Creative Commons. Retrieved July 26, 2015.
  17. 1 2 "CC0". Creative Commons. Retrieved February 22, 2010.
  18. ↑ "Creative Commons — Attribution 3.0 United States". Creative Commons. November 16, 2009. Retrieved February 22, 2010.
  19. ↑ Murray, Laura (2014). Putting intellectual property in its place: rights discourses, creative labor, and the everyday. Oxford: Oxford University Press. p. 25. ISBN 0-19-933626-1.
  20. ↑ "Worldwide". Creative Commons. Archived from the original on December 21, 2009.
  21. ↑ Peters, Diane (November 25, 2013). "CC's Next Generation Licenses — Welcome Version 4.0!". Creative Commons. Retrieved November 26, 2013.
  22. ↑ "What's new in 4.0?". Creative Commons. 2013. Retrieved November 26, 2013.
  23. ↑ "CC 4.0, an end to porting Creative Commons licences?". TechnoLlama. September 25, 2011. Retrieved August 11, 2013.
  24. ↑ Doug Whitfield (August 5, 2013). "Music Manumit Lawcast with Jessica Coates of Creative Commons". YouTube. Retrieved August 11, 2013.
  25. ↑ "CC Affiliate Network". Creative Commons. Retrieved July 8, 2011.
  26. ↑ "Frequently Asked Questions: What if CC licenses have not been ported to my jurisdiction?". Creative Commons. Retrieved November 26, 2013.
  27. ↑ "Frequently Frequently Asked Questions". Creative Commons. February 2, 2010. Retrieved February 22, 2010.
  28. ↑ "Defining Noncommercial report published". Creativecommons.org. Retrieved September 20, 2013.
  29. ↑ "The Case for Free Use: Reasons Not to Use a Creative Commons -NC License". Freedomdefined.org. August 26, 2013. Retrieved September 20, 2013.
  30. ↑ Till Kreutzer (2014). Open Content – A Practical Guide to Using Creative Commons Licenses (PDF). Wikimedia Deutschland e.a. ISBN 978-3-940785-57-2. Retrieved March 23, 2015.
  31. ↑ "Downloads". Creative Commons. 2015-12-16. Retrieved 2015-12-24.
  32. ↑ 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 by Dr. Till Kreutzer, attorney-at-law in Berlin, Germany
  33. ↑ "Creative Commons Launches CC0 and CC+ Programs" (Press release). Creative Commons. December 17, 2007. Retrieved February 22, 2010.
  34. ↑ Baker, Gavin (January 16, 2009). "Report from CC board meeting". Open Access News. Retrieved February 22, 2010.
  35. ↑ "Expanding the Public Domain: Part Zero". Creativecommons.org. Retrieved September 20, 2013.
  36. 1 2 Christopher Allan Webber. "CC withdrawl of CC0 from OSI process". In the Open Source Initiative Licence review mailing list. Retrieved February 24, 2012.
  37. ↑ "Marking and Tagging the Public Domain: An Invitation to Comment". Creativecommons.org. August 10, 2010. Retrieved September 20, 2013.
  38. ↑ "Copyright-Only Dedication (based on United States law) or Public Domain Certification". Creative Commons. August 20, 2009. Retrieved February 22, 2010.
  39. ↑ "Using CC0 for public domain software". Creative Commons. April 15, 2011. Retrieved May 10, 2011.
  40. ↑ "Various Licenses and Comments about Them". GNU Project. Retrieved April 4, 2015.
  41. ↑ Carl Boettiger. "OSI recognition for Creative Commons Zero License?". In the Open Source Initiative Licence review mailing list. opensource.org. Retrieved February 1, 2012.
  42. ↑ The Open Source Initiative FAQ. "What about the Creative Commons "CC0" ("CC Zero") public domain dedication? Is that Open Source?". opensource.org. Retrieved May 25, 2013.
  43. ↑ "Unsplash is a site full of free images for your next splash page". The Next Web. Retrieved 2015-11-13.
  44. ↑ "License | Unsplash". unsplash.com. Retrieved 2015-11-13.
  45. ↑ "Why Building Something Useful For Others Is The Best Marketing There Is". Fast Company. Retrieved 2015-11-13.
  46. ↑ "Blogstock is building the Shutterstock or Unsplash of written content - Startup Daily". Startup Daily. Retrieved 2015-11-13.
  47. ↑ "Lawrence Lessig | Unsplash Book". book.unsplash.com. Retrieved 2015-11-13.
  48. ↑ "Frequently Asked Questions". CC Wiki. Retrieved March 25, 2014.
  49. ↑ Katz, Zachary (2005). "Pitfalls of Open Licensing: An Analysis of Creative Commons Licensing". IDEA: The Intellectual Property Law Review 46 (3): 391.
  50. ↑ "Creative Commons Case Law". Retrieved August 31, 2011.
  51. ↑ "Creative Commons license upheld by court". News.cnet.com. Retrieved December 24, 2012.
  52. ↑ Digital Copyright and the Consumer Revolution: Hands Off My Ipod - Matthew Rimmer - Google Böcker. Books.google.se. Retrieved December 24, 2012.
  53. ↑ "Creative Commons License Upheld by Dutch Court". Groklaw. March 16, 2006. Retrieved September 2, 2006.
  54. ↑ "Creative Commons Licenses Enforced in Dutch Court". Retrieved August 31, 2011.
  55. 1 2 Cohen, Noam. "Use My Photo? Not Without Permission.". New York Times. Retrieved September 25, 2007. One moment, Alison Chang, a 15-year-old student from Dallas, is cheerfully goofing around at a local church-sponsored car wash, posing with a friend for a photo. Weeks later, that photo is posted online and catches the eye of an ad agency in Australia, and the altered image of Alison appears on a billboard in Adelaide as part of a Virgin Mobile advertising campaign.
  56. ↑ Evan Brown (January 22, 2009). "No personal jurisdiction over Australian defendant in Flickr right of publicity case". Internet Cases, a blog about law and technology. Archived from the original on July 13, 2011. Retrieved September 25, 2010.
  57. ↑ "Lawsuit Against Virgin Mobile and Creative Commons – FAQ". Retrieved August 31, 2011.
  58. ↑ Mia Garlick (March 23, 2006). "Spanish Court Recognizes CC-Music". Creative Commons. Retrieved September 25, 2010.
  59. ↑ "Sentencia nº 12/2006 Juzgado de lo Mercantil nº 5 de Madrid | Derecho de Internet" (in Spanish). Derecho-internet.org. Retrieved 2015-12-24.
  60. ↑ CMLP Staff (August 5, 2010). "GateHouse Media v. That's Great News". Citizen Media Law Project. Retrieved April 20, 2012.
  61. ↑ Guadamuz, Andres. "US Court interprets copyleft clause in Creative Commons licenses". TechnoLlama. Retrieved 10 December 2015.
  62. ↑ "Content Directories". creativecommons.org. Retrieved April 24, 2009.
  63. ↑ "Case Studies". Creative Commons. Retrieved December 20, 2011.
  64. ↑ Lessig, Lawrence (June 4, 2007). "Retiring standalone DevNations and one Sampling license". Creative Commons. Retrieved July 5, 2007.
  65. ↑ "Developing Nations License". Creative Commons. Retrieved April 9, 2012.
  66. ↑ "Sampling 1.0". Creative Commons. Retrieved April 9, 2012.
  67. ↑ "Sampling Plus 1.0". Creative Commons. November 13, 2009. Retrieved April 9, 2012.
  68. ↑ "NonCommercial Sampling Plus 1.0". Creative Commons. November 13, 2009. Retrieved April 9, 2012.

External links

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This article is issued from Wikipedia - version of the Saturday, April 23, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.