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Wannas learn Fair Use? Actually read the Terms of Service liscense that pops up when you install a commercial game. Basically, only you can use the software on one computer for noncommercial uses (this is the most common liscense, photoshop liscense is obviously different.) All copies of the software are for backups ONLY. You cannot use copies on other computers, you cannot give out copies to friends, and you cannot copy and sell the program. You can only USE the software. Only the software maker, if copyrighted, can give copies out for sale or for free. That's the technical aspect. Practically, you can't copy the program and give it out to others.
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This is not an example of fair use. This is an example of the software companies regulating how you can and cannot use the product you purchased. Most of the stuff in agreements you "agree" to is rather illegal. They may or may not hold up to a legal challenge. Their lobbiests are working hard to erode away the mandate given by taking exactly these actions.
Fair use is different. Fair use is impossible to define, because it is one of those things of "I'll know it when I see it"
It is not fair use to buy one copy of a game, copy it on 100 computer systems, and have people come into the area and pay you to play a copy of that game on one of the computers. It IS fair use to let a friend play it on your computer. There are hundreds of shades of gray there. It is perfectly legal for you to lend your game to your friend to play. It is perfectly legal to sell it to your friend. It does have to be a transfer of ownership though. It is not okay for you to have it and give it to your friend as well. That is not fair use.
It is legislature attacking that, and DRM attacking that, the ability to lend your friend a game, that reduces the respect for the mandate for Copyright. Fair use is being legislated against in an effort to "eliminate" piracy. They have this vision that fair use is the gateway to piracy, and they are wrong. The Gateway to piracy is in removing the people's moral compass needle against it. The erosion of the mandate is the most damaging thing for those who support IP can do. The legislature created for people to protect their intellectual property in the "Digital Age" is damaging the system in the most critical ways. It is removing the mandate. People don't feel bad about it, and that is the root cause of Piracy. It isn't finances, boredom, lack of quality of the games. It is just simply that they don't feel it is bad. That is why, despite PTTG??'s belief otherwise, pirates greatly outnumber hippies and citizens combined. Privateers don't exist. Privateers are pirates that don't know how to pirate, and looping them in with "lost sales" doesn't accurately reflect that they have removed the mandate to protect a person or company's rights to be paid for their effort.
Don't think this is a simple problem better targeted DRM can fix. The Genie is out of the bottle, and only by regaining the mandate can IP survive as we once knew it. Governmental Legislation, Trade Agreements, DRM, none of it will solve the problem. The Mandate must be regained, which is a PR campaign. It may even be too late for that, and copyright as we know it may be doomed, to bring us back to patronage.
(Edit: FYI, changing our way of thinking does not, in any way, affect Bay12games, which already uses a model that worked well in the middle ages. Busking. We aren't donating for "Dwarf Fortress". We are giving our Alms to the excellent performer. Our favorite programmer.)