L2/16-059

Proposal to add the Copyleft Symbol to Unicode
by David Faulks (dаvіdј_faulks@yahоο.ca)
February 23, 2016!
1. Introduction
The purpose of this proposal is to request that a codepoint be allocated in the UCS for theCopyleft Symbol !, a symbol which is derived from U+00A9 COPYRIGHT SIGN (©), only reversed. It is
proposed that the symbol be allocated at U+1F16C in the Enclosed Alphanumeric Supplement Block.
If the proposed name COPYLEFT SYMBOL (by far the most common name1) is not acceptable tothe UTC, alternative names (such as COPYLEFT SIGN, or REVERSED COPYRIGHT SIGN) are acceptable.
Since the symbol is derived from U+00A9 copyright sign, the proposed character properties
are based upon that character, but the UTC should feel free to alter the proposed properties if they wish.
1F16C;COPYLEFT SYMBOL;So;0;ON;;;;;N;;;;;As a symbol, the copyleft symbol has no special line-breaking properties, and also has nodefined collation, although one may suggest it be sorted just after (or before) ©.
The Proposal Summary Form is attached to the end of this proposal, as seems to be thepractice nowadays.

2. History
Copyleft is a term that first gained popularity with Richard Stallman's GNU Project during thelate 1980's, although the term itself can be traced back earlier. The term is currently used in a formalmanner, to refer to licensing schemes for copyrighted works that are not ‘All Rights Reserved' but
rather grant some sort of copying and modification rights to the user or recipient automatically.2
Since the Copyright Sign (©) already existed long before the term ‘Copyleft’ was invented, itseems natural to come up with a reversed Copyright Sign to denote Copyleft. This submitter has not
1 A Google search for "copyleft symbol" returns over 8,700 results.
2 See: http://www.gnu.org/copyleft/
1been able to find any precise origin or date for the Copyleft Symbol, but at least one TEX font family
under development in 19963 included a glyph for the Copyleft Symbol. The symbol was informallyadopted as a logo for those supporting the concept of copyleft, but was never trademarked, and even in
1996 there were hopes it would become available as an in-text symbol.
In 2000, a lengthy discussion on the Unicode mailing list4 was the first to mention thepossibility of encoding the symbol. However, the original posters did not understand that Unicode wasintended for standardizing symbols already in-use in-text, and no submission resulted. Later, much
shorter mentions of the Copyleft were made in the mailing list, in 2008, 2009, and 2012, but in general,characters do not get added to Unicode unless someone steps up and submits a proposal with evidenceof usage.
However, this lack of a Unicode codepoint has not stopped some people from using thesymbol in-text —as an alternative to the copyright sign— anyway.

3. UseThe Copyleft Symbol is typically used in ‘copyright’ statements, often alongside statements
like ‘All wrongs reserved’ or ‘All rights reversed’. The users are those who want to grant permission tocopy the document, but who (in most cases) do not feel inclined to use a more formal method like
Creative Commons or the GNU Free Documentation License.

4. Demand
This proposal is an individual proposal and is not made with the support or backing of any
organization. Despite popularizing the term ‘Copyleft’, the Free Software Foundation does notpromote use of the symbol, and notes using the symbol as a ‘legal mistake’.5 However, manyindividuals do wish to use the Copyleft Symbol in text, and often assume it is available for use as such,
until they find out otherwise.
Evidence can be found by using Google to search for "copyleft symbol". Of the first 20
results, 9 are from those wanting or expecting to use the copyleft symbol as a symbol in text.6
3 As documented in: https://www.tug.org/TUGboat/tb17-2/tb51omeg.pdf
4 See: http://unicode.org/mail-arch/unicode-ml/Archives-Old/UML022/thread.html#846
http://unicode.org/mail-arch/unicode-ml/Archives-Old/UML022/thread.html#973
5 This is stated at the end of the Copyleft explanation at : http://www.gnu.org/licenses/copyleft.en.html
6 Try it yourself: https://www.google.ca/#q=%22copyleft+symbol%222

Figure 1: Part of a screenshot of the Google
results is to the right.
Those asking questions on how toinsert the copyleft symbol are typically told toinsert images, or create their own font.7
However, a number of people have come up
with CSS styles using transforms to reverse anormal copyright sign instead8—a sign that theyfind using images unsatisfactory, and wish for a symbol that matches the typeface or font they areusing.

5. A New Codepoint is Best
Theoretically, the copyleft symbol could be encoded using a sequence, using U+2184 LATIN
SMALL LETTER REVERSED C or U+0254 LATIN SMALL LETTER OPEN O, followed by U+20DD
COMBINING ENCLOSING CIRCLE.
However, this theory does not work well in practise. Only a small proportion of fonts evenhave a glyph for U+20DD, and almost none of them make any attempt to make the enclosing circle
character work, as seen below:
Figure 2: Attempting to write the copyleft using open o or reversed c, using the fonts Consolas, Segoe
UI Symbol, Symbola, and Yu Gothic UI. These are the only 4 fonts on my system which have a glyphfor U+20DD.

In addition, treating circled or enclosed letters as sequences does not seem to follow Unicode
practice or encoding history. None of the circled or squared letters or digits have canonicalequivalence9 to the corresponding letters or digits followed by U+20DD or U+20DE. This includes
many squared characters in the Enclosed Alphanumeric Supplement Block, proposed in 200910 and7 As seen here: http://www.makeuseof.com/answers/write-copyleft-symbol-word-document/
8 Two examples: https://medium.com/@mmeida/how-to-insert-the-copyleft-symbolf093113cc2cf#.s9owu3km1, and answer #6 at http://stackoverflow.com/questions/282171/how-towriting-cc-the-creative-commons-logo-in-html
9 The decompositions given in http://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt
indicate compatibility decompositions only.
10 As seen here : http://www.unicode.org/L2/L2009/09295-n3671-abc.pdf
3released as part of Unicode 6 in 2010, well after the UTC had stopped accepting precomposedcharacters.
Therefore, this submitter feels that the Copyleft Symbol is best treated as an atomic character.

6. Samples
The following 15 samples, all located within PDF documents, were found via searching
Google for documents containing typical copyleft phrases such as ‘all rights reversed’, or ‘all wrongs
reserved’, and therefore do not necessarily reflect all the ways in which the copyleft symbol is used.
Within these samples, the copyleft symbol is circled in sky blue.

Sample 1
From: http://www.localjewishnews.com/wp-content/uploads/2015/10/Cleveland-Minyanim-HourlyOct-21-2015.pdf
The top-left corner of the first page of contains the copyleft symbol.

Sample 2
From: http://liu.diva-portal.org/smash/get/diva2:861292/FULLTEXT01.pdf
The copyleft symbol appears on Page 2 of the thesis: Upscaling Organic Electronic Devices, byAbdellah Malti.

4Sample 3
From: http://nemertes.lis.upatras.gr/jspui/bitstream/10889/991/3/Nimertis_Rautopoulou.pdf
The copyleft symbol appears on Page 4 of this Masters thesis for the University of Patras :Ολοκληρωση Νεων Τεχνουργηματων στην Εφοδιαστικη Αλυσιδα των Επιχειρησεων, by Raftopoulou
Angeliki.

Sample 4
From: http://www.nathanson.org/davesays/wp-content/uploads/2011/04/Morse-Code-decoder-chart-az.pdf
This Morse Code Receive Decoder Chart, by Dave Nathanson has the copyleft symbol in the lower
left corner.

Sample 5
From: https://my.sehir.edu.tr/UNI103/Documents/ckk-opensource.pdf
The copyleft symbol appears on the final page (page 11) of this slide-show presentation of Open
Source { Free } Software, by Çetin Kaya Koç.

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Sample 6
From:
http://pub.epsilon.slu.se/11318/1/conference_book_8th_phd_students_conference_scandinavian_plant_physiology_society.pdf
The 3rd page of the Conference Book, for The 8th Scandinavian Plant Physiology Society
PhD Students Conference contains the following, which includes the copyleft symbol.

Sample 7
From: http://s.cdn.victorz.ca/dl/docs/Hat%20Religion.pdf
The rather tongue-in-check document—Hat-ism Religion Definition v1.2 Final—contains the copyleft
symbol near the upper right corner.

Sample 8
From: http://www.asiteaboutnothing.net/pdf_rhythms_4.pdf
Andy has included the copyleft symbol at the bottom right of this ‘rhythm cheat sheet’.

6Sample 9
From: http://www.smd.ff.vu.lt/wp-content/uploads/2013/10/Figures-are-ugly.pdf
The copyleft symbol appears on page 1 of ‘Gražūs grafikai’ which seems to be a slide-showpresentation (in Lithuanian) about the use of charts.

Sample 10
From: http://webdiis.unizar.es/~ricardo/files/slides/academic/slides_RJM-ACSD-12.pdf
The first page of this slide-show—for a performance optimization tool called PeabrainN—has acopyleft symbol, despite the PDF document permissions being set to prevent Content Copying.

Sample 11
From: http://edoc.bibliothek.unihalle.de/servlets/MCRFileNodeServlet/HALCoRe_derivate_00003994/schretter_thesis.pdf
The dissertation: Correction of Non-Periodic Motion in Computed Tomography, by Colas Schrettercontains the copyleft symbol on Page 4.

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Sample 12
From: http://www.mbtrans.info/MB_Translations/Downloads_files/S%CC%8Cikmookej.pdf
This translation into Czech of Jack London's The Chinago contains the copyleft symbol under thename of the translator on page 1.

Sample 13
From: https://wessexsolidarity.files.wordpress.com/2013/08/aalu_a5.pdf
The leaflet: An Anarchist argument for left unity, by ‘Mal Content’ contains the sample below on page
4 of the PDF.

Sample 14
From: https://bodhipunx.files.wordpress.com/2013/07/spheres-of-revolution-by-adam.pdf
The document: Spheres of Revolution : Specifism and Organizational Dualism, by Adam, contains a
copyleft symbol as well as a creative commons logo, on the first page.

8Samples 15 and 16
From: http://daltex.phpnet.org/daltex-lab/analogic-pixel_session01/pdf/images/DTX-lab.pdf
This PDF copy of a booklet from DALTeX-lab contains the copyleft symbol in several places, thesamples below are from page 7 and page 13.

9ISO/IEC JTC 1/SC 2/WG 2
PROPOSAL SUMMARY FORM TO ACCOMPANY SUBMISSIONSFOR ADDITIONS TO THE REPERTOIRE OF ISO/IEC 10646 11
Please fill all the sections A, B and C below.
TPPT

Please read Principles and Procedures Document (P & P) from http://std.dkuug.dk/JTC1/SC2/WG2/docs/principles.html for guidelines anddetails before filling this form.
Please ensure you are using the latest Form from http://std.dkuug.dk/JTC1/SC2/WG2/docs/summaryform.html .
See also http://std.dkuug.dk/JTC1/SC2/WG2/docs/roadmaps.html for latest Roadmaps.
HTU

UTH

HTU

HTU

UTH

UTH

A. Administrative
Proposal to add the Copyleft Symbol to Unicode
1. Title:
2. Requester's name:David Faulks
3. Requester type (Member body/Liaison/Individual contribution):
Individual contribution
4. Submission date:February 23, 2016
5. Requester's reference (if applicable):
6. Choose one of the following:This is a complete proposal:
YES(or) More information will be provided later:
B. Technical – General
1. Choose one of the following:a. This proposal is for a new script (set of characters):
NO
Proposed name of script:
b. The proposal is for addition of character(s) to an existing block:
YES
Name of the existing block:
Enclosed Alphanumeric Supplement
2. Number of characters in proposal:
1
3. Proposed category (select one from below - see section 2.2 of P&P document):
A-Contemporary✔ B.1-Specialized (small collection)
B.2-Specialized (large collection)
C-Major extinct
D-Attested extinct
E-Minor extinct
F-Archaic Hieroglyphic or Ideographic
G-Obscure or questionable usage symbols
4. Is a repertoire including character names provided?
YES
a. If YES, are the names in accordance with the “character naming guidelines”
in Annex L of P&P document?
YES
b. Are the character shapes attached in a legible form suitable for review?
YES
5. Fonts related:a. Who will provide the appropriate computerized font to the Project Editor of 10646 for publishing the standard?
The requester (David Faulks).
b. Identify the party granting a license for use of the font by the editors (include address, e-mail, ftp-site, etc.):
David Faulks (dаvіdј_faulks@yahоο.ca)
6. References:a. Are references (to other character sets, dictionaries, descriptive texts etc.) provided?
YES
b. Are published examples of use (such as samples from newspapers, magazines, or other sources)of proposed characters attached?
YES
7. Special encoding issues:
Does the proposal address other aspects of character data processing (if applicable) such as input,presentation, sorting, searching, indexing, transliteration etc. (if yes please enclose information)?
NO
8. Additional Information:
Submitters are invited to provide any additional information about Properties of the proposed Character(s) or Script that will assist
in correct understanding of and correct linguistic processing of the proposed character(s) or script. Examples of such properties
are: Casing information, Numeric information, Currency information, Display behaviour information such as line breaks, widths
etc., Combining behaviour, Spacing behaviour, Directional behaviour, Default Collation behaviour, relevance in Mark Up contexts,
Compatibility equivalence and other Unicode normalization related information. See the Unicode standard at
http://www.unicode.org for such information on other scripts. Also see Unicode Character Database (http://www.unicode.org/reports/tr44/ ) and associated Unicode Technical Reports for information needed for consideration by theUnicode Technical Committee for inclusion in the Unicode Standard.
HTUUTHH

11 Form number: N4502-F (Original 1994-10-14; Revised 1995-01, 1995-04, 1996-04, 1996-08, 1999-03, 2001-05, 2001-09, 2003-11, 2005-01, 2005TPPT

09, 2005-10, 2007-03, 2008-05, 2009-11, 2011-03, 2012-01)

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C. Technical - Justification
1. Has this proposal for addition of character(s) been submitted before?
NO
If YES explain
2. Has contact been made to members of the user community (for example: National Body,
NO
user groups of the script or characters, other experts, etc.)?
If YES, with whom?
If YES, available relevant documents:
3. Information on the user community for the proposed characters (for example:
YES
size, demographics, information technology use, or publishing use) is included?
see§3.
Use,and§4.
DemandReference:
4. The context of use for the proposed characters (type of use; common or rare)
currently raresee §6. Samples
Reference:
5. Are the proposed characters in current use by the user community?
YES
see §6. Samples
If YES, where? Reference:
6. After giving due considerations to the principles in the P&P document must the proposed characters be entirely
NOin the BMP?
If YES, is a rationale provided?
If YES, reference:
7. Should the proposed characters be kept together in a contiguous range (rather than being scattered)?
N/A
8. Can any of the proposed characters be considered a presentation form of an existing
NOcharacter or character sequence?
If YES, is a rationale for its inclusion provided?
If YES, reference:
9. Can any of the proposed characters be encoded using a composed character sequence of eitherNO?
existing characters or other proposed characters?
YES
If YES, is a rationale for its inclusion provided?
see§5.
ANew
CodepointisBest
If YES, reference:
10. Can any of the proposed character(s) be considered to be similar (in appearance or function)NOto, or could be confused with, an existing character?
If YES, is a rationale for its inclusion provided?
If YES, reference:
11. Does the proposal include use of combining characters and/or use of composite sequences?
If YES, is a rationale for such use provided?
If YES, reference:
Is a list of composite sequences and their corresponding glyph images (graphic symbols) provided?
If YES, reference:
12. Does the proposal contain characters with any special properties such ascontrol function or similar semantics?
If YES, describe in detail (include attachment if necessary)

13. Does the proposal contain any Ideographic compatibility characters?
If YES, are the equivalent corresponding unified ideographic characters identified?
If YES, reference:NONONO

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