Companies that choose to publish works under copy protection do so because they believe that the added expense of implementing the copy protection will be offset by even greater increases in revenue by creating a greater scarcity of casually copied media.
Opponents of copy protection argue that people who obtain free copies only use what they can get for free, and would not purchase their own copy if they were unable to obtain a free copy. Some even argue that it increases profit; people who receive a free copy of a music CD may then go and buy more of that band's music, which they would not have done otherwise.
Some publishers have avoided copy-protecting their products, on the theory that the resulting inconvenience to their users outweighs any benefit of frustrating "casual copying".
The Publications Rights Clearinghouse (PRC) is a collective licensing agency for writers. It collects royalties on behalf of writers from publishers with whom it has agreements for distributing such royalties.
This is similar to collective licensing for songwriters.