Hi, Claudemir,
Chris is absolutely right in practical application. However, to answer your question, current U.S. law grants an automatic protection to original artwork from the moment of its creation. However, failing to copyright and register your creation makes it vulnerable to so-called "innocent' infringers who may claim they did not know the work was protected and this makes getting a lawyer to defend your claim very iffy and time consuming unless you have LOTS of $$ to pursue it.
Unapproved usages of original works is becoming more and more pervasive and this should be a concern for all artists.
Carol
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