The copyright symbol, or copyright sign, © (a circled capital letter C for copyright), is the symbol used in copyright notices for works other than sound recordings. The use of the symbol is described by the Universal Copyright Convention. The symbol is widely recognized, but under the Berne Convention is no longer required to obtain a new copyright in most nations.
The sound recording copyright symbol is the symbol ℗ (the capital letter P enclosed by a circle), and is used to designate copyright in a sound recording.
The notice for visually perceptible copies should generally contain three elements together, or in close proximity to each other.
1. The symbol © (letter C in a circle); the word “Copyright”; or the abbreviation “Copr.”
2. The year of first publication.
3. The name of the copyright owner.
For example- © 2015 Twitter, Copyright © 2015 Apple Inc. All rights reserved., © 1997-2015 Netflix, Inc., © 2015 Instagram.
The elements for sound recordings generally require the same three elements, except the symbol is ℗ (the letter P in a circle) instead.