But some may object that protecting IP is no different from protecting regular property. That is not so. Real property is scarce. The subjects of IP are not scarce, as Stephan Kinsella explains. Images, ideas, sounds, arrangements of letters on a page: these can be reproduced infinitely. For that reason, they can’t be considered to be owned. Merchants are free to attempt to create artificial scarcity, and that is what happens when a company keeps it codes private or photographers put watermarks [...]

via Geistiges Eigentum und Knappheit