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In 1984 or 1985, programmer Don Hopkins sent Richard Stallman a letter labeled "Copyleft—all rights reversed". Stallman chose the phrase to identify his free software method of distribution. [4] It is often accompanied by a reversed version of the copyright symbol. [5] That said, the use of the reversed copyright symbol is considered legally ...
Free-software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. The GNU General Public License is an example of a license implementing strong copyleft. An even stronger copyleft license is the AGPL, which requires the publishing of the source code for software as a service use cases.
This page was last edited on 16 January 2025, at 15:32 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
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. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
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.