From a legal point of view, in countries that have joined the Berne Convention, copyright protection is provided as soon as the work (whether text or picture) comes out, and it is not necessary to declare it. However, as a general rule, this small line of text still serves as a good reminder to the viewer that the content they are viewing is protected by copyright. Please pay attention to punctuation and capitalization, which is also a sign of professionalism.
The correct format should be: Copyright [dates] by [author/owner]© usually can be used instead of Copyright, but (c) cannot be used. All Rights Reserved used to be required in some countries, but now in most countries, it is not legally required.
See below for some correct formats:
©1995-2004 Macromedia, Inc. All rights reserved.
©2004 Microsoft Corporation. All rights reserved.
Copyright © 2004 Adobe Systems Incorporated. All rights reserved.
©1995-2004 Eric A. and Kathryn S. Meyer. All Rights Reserved.
Now popular some rights reserved: creativecommons.org
Some rights reserved and copyright are not contradictory in themselves, but the boundary between them is more of a moral issue. The real reservation of some rights refers to the right of fair use to viewers. The definition of fair use is by no means random use or plagiarism.
It is even said that in addition to copyright, there is also copyleft, which is defined as a way for programmers to develop and share source code. Free in English is not just free. Moreover, this kind of source code is open to the public and free to use, and it does not conflict with copyright at all. Please don’t misunderstand!