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The copyright symbol, or copyright sign, designated by (a circled capital letter "C"), is the symbol used in copyright notices for works other than sound recordings.
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
The symbol is encoded in Unicode as U+1F16E CIRCLED C WITH OVERLAID BACKSLASH, [3] which was added in Unicode 13.0 in March 2020. [4] As there is no single definition of public domain and copyright laws differ by jurisdiction, a work can be in the public domain in some countries while still being under copyright in others (so called hybrid status).
Web pages authored using HyperText Markup Language may contain multilingual text represented with the Unicode universal character set.Key to the relationship between Unicode and HTML is the relationship between the "document character set", which defines the set of characters that may be present in an HTML document and assigns numbers to them, and the "external character encoding", or "charset ...
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
All copyright and other proprietary notices must be retained in the document. This permission does not extend to materials owned by other content providers that appear on this web site. You may not reproduce, copy, or redistribute the design or layout of this website, individual elements of the website design, or our logos without our express ...
Incorrect HTML entity escaping may also open up security vulnerabilities for injection attacks such as cross-site scripting. If HTML attributes are left unquoted, certain characters, most importantly whitespace, such as space and tab, must be escaped using entities. Other languages related to HTML have their own methods of escaping characters.
According to US copyright law the copyright notice must be affixed and positioned to give "reasonable notice of the claim of copyright". [12] There are slightly different technical requirements for copyright notice on phonographic recordings, specifically using a sound recording copyright symbol ("℗") instead of the "©" symbol. [13]