Z:gnu-www-ja-public-domain-manifesto--c8e6ba-General Principle 5 opposes co/en

General Principle 5 opposes contracts that restrict use of copies of public domain works. But where we most need to oppose such contracts is where they apply to works that are still copyrighted (this is how Amazon tries to claim that you don't own the e-book that you bought). Likewise, General Principle 5 condemns DRM, but only when it applies to a public domain work. In effect, it legitimizes most real DRM by omitting it from criticism.