Copying is not theft.
Stealing a thing leaves one less left
Copying it makes one thing more;
that’s what copying’s for.
Copying is not theft.
If I copy yours you have it too
One for me and one fo...
Some people believe it's theft because you're potentially undermining their ability to sell it. A big company can often produce your widget faster and distribute it better than you can (assuming you're a small company or an individual), thus it's not a fair competition to profit from the idea. Just providing the other side of the argument.