Copyright comes into existence as soon as a work is created and no formality is required to be completed for acquiring Copyright in India. However, certificate of registration of Copyright and the entries made therein serve as a prima facie evidence in a court of law and therefore, would help in establishing authorship and also infringement.
In case the author or the owner decides not to register, the work should be properly dated and signed. This may be useful in case of engineering drawings.
Note: In case of registered or unregistered work, the symbol “c” with circle “© “ is used along with the name of author, year of first publication on the work, to signify that work is under Copyright protection for a specific duration. If this sign is associated with any work, it means the work is Copyrighted.
Source: Copyright Office, Government of India.