Currently we have issues with with filesharing, where people share software, music, movies, etc that doesn't belong to them.

With the invent of 3D printing / scanning, I foresee a larger, harder to control issue. "Item sharing"

Instead of just sharing music, and movies, people will begin sharing 3D model designs for popular products. People will also begin making duplicates of items they have at home.

I don't see any realistic way of stopping this (especially duplicating items with a scanner/printer combo). It could seriously hurt a lot of businesses.

What are you opinions?