I did not know this, which is why I looked it up.
I still think selling a piece of software you have no association with for profit or otherwise without announcing yourself isn't in the spirit of open source. It seems extremely odd to me to use someone else's work in a product and not que them in. If you disagree that's fine.
What are you basing your opinions on? People create and forge ahead without getting in touch with every last person that played a past part in the original work that's being used under free licenses.
It's not about whether I agree or disagree; it's that your sentiments about etiquette and spirit have no grounds and are entirely unfounded. This is normal and no one would think anything of it and make a fuss... no one is behaving in a manner that would raise even an eyebrow. The license covers all of this in advance so that two unconnected individuals don't have to get together and hash out a contract with all the details of what they did and plan to do with something every time. There are licenses that strictly stipulate you must notify the creator of your intentions and compensate as he/she desires. This isn't one of them. Artemio pointing this out in his wiki is reiterating the conditions of the license, not uniquely special permission giving the OK to end users.
Here is the one exception on his own site:
The Sega CD loader (c) by Luke Usher/SoullessSentinel and is not under the GPL, used with permission for this project.
Please read up:
http://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.en.html#DoesTheGPLAllowMoney
Does the GPL allow me to sell copies of the program for money?
Yes, the GPL allows everyone to do this. The right to sell copies is part of the definition of free software. Except in one special situation, there is no limit on what price you can charge. (The one exception is the required written offer to provide source code that must accompany binary-only release.)
Do I have “fair use” rights in using the source code of a GPL-covered program?
Yes, you do. “Fair use” is use that is allowed without any special permission. Since you don't need the developers' permission for such use, you can do it regardless of what the developers said about it—in the license or elsewhere, whether that license be the GNU GPL or any other free software license. Note, however, that there is no world-wide principle of fair use; what kinds of use are considered “fair” varies from country to country.
Of course it's in the spirit of open source. It's in the licence itself upon which the software is registered under.
Exactly.