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Fair use is generally a short excerpt and almost always attributed. (One should not use much more of the work than is needed to make the commentary.

It should not harm the commercial value of the work -- in the sense of people no longer needing to buy it (which is another reason why reproduction of the entire work is a problem.) Famously, copying just 300 words from Gerald Ford's 200,000 word memoir for a magazine article was ruled as not fair use, in spite of it being very newsworthy, because it was the most important 300 words -- why he pardoned Nixon.

The "fair use" concept varies from country to country, and has different names (such as "fair dealing" in Canada) and other limitations outside the USA.

False. U.S. Copyright law is quite explicit that the making of what are called "derivative works" -- works based or derived from another copyrighted work -- is the exclusive province of the owner of the original work. This is true even though the making of these new works is a highly creative process. If you write a story using settings or characters from somebody else's work, you need that author's permission. Yes, that means almost all "fan fiction" is arguably a copyright violation. If you want to publish a story about Jim Kirk and Mr. Spock, you need Paramount's permission, plain and simple. Now, as it turns out, many, but not all holders of popular copyrights turn a blind eye to "fan fiction" or even subtly encourage it because it helps them. Make no mistake, however, that it is entirely up to them whether to do that.

Don't rationalize whether it hurts the owner or not, ask them.

n general, respecting the rights of creators to control their creations is a principle many advocate adhering to.

Copyright law was recently amended by the Digital Millennium Copyright Act which changed net copyright in many ways. In particular, it put all sorts of legal strength behind copy-protection systems, making programs illegal and reducing the reality of fair use rights.

The DMCA also changed the liability outlook for ISPs in major ways, many of them quite troublesome.

False. Whether you charge can affect the damages awarded in court, but that's main difference under the law. It's still a violation if you give it away -- and there can still be serious damages if you hurt the commercial value of the property.

False. Copyright is effectively never lost these days, unless explicitly given away. You also can't "copyright a name" or anything short like that, such as almost all titles. You may be thinking of trade marks, which apply to names, and can be weakened or lost if not defended.

You generally trademark terms by using them to refer to your brand of a generic type of product or service. Like a "Delta" airline. Delta Airlines "owns" that word applied to air travel, even though it is also an ordinary word. Delta Hotels owns it when applied to hotels. (This case is fairly unusual as both are travel companies. Usually the industries are more distinct.) Neither owns the word on its own, only in context, and owning a mark doesn't mean complete control -- see a more detailed treatise on this law for details.