influence such factors as: How others can legally use your software If your own projects become “infected” by a license you didn’t choose Whether you must distribute source code if you distribute or even use software to serve up content How others can use your photos on Flickr and other sources Understanding how Wikipedia and other open references work Whether you get sued for a LOT of money.
Within the U.S., copyright law is consistent between states because it is federal law and cannot generally be modified by the states. In fact, copyright law is relatively consistent worldwide because of the multitude of treaties concerning it, though some countries are more selective about enforcement than others. However, other types of “intellectual property”, such as trade secrets, may vary from state to state in the U.S.
from international treaties (Universal Copyright Convention, Geneva Phonograms Convention, Berne Convention, WTO Agreement, WIPO Copyright Treaty, WIPO Performances and Phonograms Treaty) Authority for Congress to regulate is spelled out in the Constitution
choreographic, pictorial, graphic, sculptural, motion picture, audiovisual, sound recording, or architectural work The work must be in a “fixed medium” No declaration or registration required Source code qualifies 17 USC §117 outlines special rights for software rights holders
e.g. practice law, drive a car, or operate an amateur radio station Copyright licenses are more or less promises not to sue, although there isn’t a terribly clear line drawn between what constitutes a copyright license and what constitutes a contract (most commonly an adhesion contract). The difference is slightly technical but has impact on such factors as whether mandatory arbitration might apply
an adhesion contract, mostly untested in court, generally not very user-friendly You can think of most websites as being closed in terms of licensing; even if the content is free, NYT doesn’t want you running off with their stuff
Some sites such as Flickr and Wikipedia make it easy to look up the licensing of posted items, and Wikipedia even undertakes active policing to ensure that media is openly licensed Just bear in mind that whatever you find, you need to make sure the license lines up with the way you want to use the material
holder usually has broad control over the work, there are exceptions for public policy reasons 17 USC §107- whether a given use is fair use is a question of fact and can be very difficult to work out in a particular case Generally, okay to use parts of works reasonably necessary for personal use, reporting news, education, or parodies
license “contaminates” your code. GPL: if you modify code and wish to distribute, you must distribute the source as well LGPL: slightly less restrictive; meant for libraries AGPL: more restrictive, bunch of interesting provisions related to DMCA/modern treaties, designed for network server software
work based upon one or more preexisting works, such as a translation, musical arrangement, dramatization, fictionalization, motion picture version, sound recording, art reproduction, abridgment, condensation, or any other form in which a work may be recast, transformed, or adapted. A work consisting of editorial revisions, annotations, elaborations, or other modifications, which, as a whole, represent an original work of authorship, is a “derivative work”.
allow commercial use. The idea is to encourage vendor support and allow tinkering without fussing too much over what is commercial or not Ultimately, what is and is not commercial in nature is a question of fact and may be very difficult to determine. “Best Practice” is probably to stay away from these licenses, although I’m not practicing what I’m preaching- you may have noticed that these slides are licensed for non-commercial use only.
mean? Short answer: not that important if you are choosing. There are a lot of licenses out there, but if you are interested in licensing your project openly, I recommend OSI-approved licenses. Opensource.org