Unicode Consortium Policies
This page documents official policies maintained by the
Consortium. The Consortium may add further policies as
appropriate in the future. The
Technical Committees also have established
Procedures that govern the workings of those committees.
Resolutions of the Technical Committees on external issues
of particular public importance to the computing industry are
Consortium Public Positions.
The Unicode Consortium has a number of stability policies regarding the various standards, registries,
and repositories that it develops or maintains. These policies are put in place to assure the continued
reliability of these resources and to provide implementers guarantees about the limits of allowed kinds of
changes for any updates and new versions.
Character Encoding Stability
Unlike many other standards, the Unicode Standard regularly requires updating to expand its repertoire
New characters are added to meet a variety of uses, ranging from technical symbols to letters for regional
scripts or for archaic languages. Character properties are also expanded or revised to meet new implementation
requirements. However, changes to the standard must be constrained by the requirements of backward compatibility
between versions. To that end, the
Character Encoding Stability Policy limits the ways in which the Unicode Standard and related Unicode
specifications can change. The Unicode Technical Committee
is responsible for the technical adherence of its standards and specifications to this policy.
Registered Code Stability
The Unicode Consortium is the registration authority for the ISO 15924
standard for script codes. Changes to the set of registered codes must be constrained by the requirements of backward
compatibility. To that end, the Unicode Registered
Code Stability Policy limits the ways in which the registrar administers the registry.
The Unicode Locales Project develops and maintains the Unicode LDML standard
and the associated data repository, the Unicode Common Locales Data Repository (CLDR). Changes to the standard and repository
are constrained to ensure backward compatibility. The
Unicode Locales Stability Policy spells out those constraints.
The Unicode CLDR-TC is responsible for the technical adherence of its
standard and repository to this policy.
The Unicode Consortium Patent Policy
is based on the ANSI Patent Policy. The only changes are to adapt
the policy to refer to the Unicode Consortium, The Unicode Standard
and Unicode Technical Reports and Standards.
this policy can be found at General
The Consortium has a policy regarding
handling company confidential and private data submitted via e-mail or into technical committee document registers.
Trademark and Logo
Rules that govern the use of the Unicode Logo and the Unicode
trademark are explained in the Trademark
and Logo Policy page.
Fonts submitted to the Consortium as part of standardization
related work are subject to the Font
The use of e-mail lists maintained by the Unicode Consortium is subject to
the Mail List Policy as well as the
The use of this site is subject to the