File for copyright? how do you mean: Copyright is implicit, unlike patents, upon creation of a work.
>You must register your copyright with the U.S. Copyright Office before you are legally permitted to bring a lawsuit to enforce it. [2]
[1] https://en.wikipedia.org/wiki/Copyright_registration#Require... [2] http://www.nolo.com/legal-encyclopedia/copyright-registratio...
You meant "linearly", right?