in Communication Ethics
This entry is part of the BlogBook called "The Ethics of Modern Communication".
If someone was foolish enough to grant a patent on the Mona Lisa, it would not have a great impact on society in general; it's only one painting and it's not ever going to be repeated accidentally. For those who would reproduce it deliberately (traditionally called "forgery") patent laws won't stop them anyhow. The Mona Lisa is phenomenally complicated, including all kinds of little details and hidden layers of paint. But that's not really comparable to the kind of patents the Patent Office is granting.
