OSX is Mac only...and fairly new Macs at that.
Copyright law is usually violated the instant you install a product you don't own. What open source is all about, is to provide users with software which is free of charge as long as you follow certain rules. The point is that some people think this will let software evolve in a more user-friendly way, because the commercial aspects of a product is not so strong.
http://www.opensource.org/
Open source has nothing to do with program being pirated or not - it is still possible to violate the rules of an open source program and thus use it illegally.
I think open source is a natural extension of "shareware", but it allows many developers to participate on developing the same product.
Tormod
