EDIT Copyright Sign Today, the US Patent and Trademark Office copyright sign is one of the most widely spread characters throughout the world and is unanimously understood as a copyright note although most people do not know its exact legal meaning.
 
EDIT Use of character The copyright sign is used in combination with the copyright holder\'s name and the year of first publication and is conspicuously displayed. It is spaced (Copyright © 2004 by name), omission of the words »Copyright« and »by« is optional (© 2004 name).

Under no circumstances should the outdated notation (c) be used - it dates back to the times when the proper copyright sign was not yet available on computers (leave alone typewriters). See also U+249E PARENTHESIZED LATIN SMALL LETTER C
 
EDIT Brand law - meaning The copyright sign © U+00A9 COPYRIGHT SIGN signifies copyright protection, or protection against liability for copyright infringement, and implies an economic claim.
 
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U+00A9 COPYRIGHT SIGN
DEUTSCH : ENGLISH