Tomasz:
And copyright is evil law that should be abolished..
As already noted, this opinion may not be shared by everyone here :)
If no-one obeys copyright, all software is free.
It's gratis, but not libre. Abolishing copyright doesn't create libre software, to that you also need to make availability of source code compulsory.
Computer software, unlike every[1] other item protected by copyright, is not self-evident, so having no copyright would be absolutely useless for the common good. Whether or not copyright fosters production by potential authors is irrelevant here.
When you read a book, you have all information. When you listen to music you have all information. When you run a program you have no information at all. Recreating "source code" for books and music once you have a "runnable" copy is a very little effort. For computer programs it's impossible. Without copyright you'd be able to exploit the four freedoms for every authoral work but software.
Moreover, we need copyright to enforce copyleft. Without copyright, we can't ensure our software is not proprietarized.
[1] I may forget some item, but "most" applies even if I am wrong