Article 1271. The copyright mark
The rightholder for notification on belonging to him the exclusive right in a work may use a copyright notice that is placed on each copy of the work and consists of the following elements: Latin letter "C" in a circle; name or names of the copyright owner; the year of first publication of the work.
Like all answers in bold :) If more:
— Mark is not mandatory, used to inform visitors that their rights you know, if there will be a little easier to bring him in for violating them
— the symbol © (C) is a replacement for ASCII e.g. legal substitute to serve is unlikely, in my opinion, that is tantamount to lack of
— after sign the name
— after the year of creation
Years separated by a dash, are used for convenience, so as not to "number" each matter separately, but generally speaking the second year of the void is brought before you misinform the visitor, reducing the validity of their rights — may play against you