That's easy to disprove. Property is not an object but a right of disposal. If you steal someone's car, you have deprived them of their property because they ca

That's easy to disprove. Property is not an object but a right of disposal. If you steal someone's car, you have deprived them of their property because they can no longer dispose of their car how they wish. If you steal somebody's movie, you have deprived them of their property because they can no longer dispose of their movie how they wish (ie. control its distribution). They can still watch the movie, but their property has still been infringed. You may say that's a semantic argument, but then frankly so is this whole 'piracy isn't theft' thing.