美國的產權法的基本出發點就是讓新知識在大眾間最為廣泛地得到推廣和運用

The main goals of copyright are to encourage the development of culture, science and innovation, while providing a financial benefit to copyright holders for their works, and to facilitate access to knowledge and entertainment for the public. 

Copyright 的目的不是限製我們用。其實很多東西是不受copyright保護的。Copyright 的目的是給原作者一定的利潤作為勞動所得。Copyright其實推廣了很多東西的應用。