What does the sign © mean?

© is an abbreviation of copyright but in Germany the designation of a work with this sign is not necessary as the copyright automatically is obtained with the creation of the work.
However it is very advisable to designate publications in the internet.Concerning the designation, the © should be accompanied with the name of the person holding the rights, the number of the year of the first time publication as well as the sentence: „All rights reserved“.
Instead of the ©, there might be a reference to §§ 53, 54 UrhG, which regulate the admissibility of replication and the duty of compensation, and to § 106 UrhG, regulating the criminal liability of unauthorized use.