Copyright today

Societies in antiquity did not recognize intellectual property. The idea of copyright was born in the Middle Ages and the tradition as we know it today appeared with the printing press in the 15th century. The theory of intellectual property was developed three centuries later. From the Gutenberg printing press to MP3, copyrights have required constant adaptation to keep up with new technologies. How do things stand today? Who is protected when and how, and which are the potentials and limitations?