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Most licenses available do not seem to carry any legal weight. Are there any Open Source licenses that do? The old copyright laws used to impose a monetary fine for infringement, but then how do the newer licenses deal with infringement? What resources do I have available if the terms of the "newer" licenses are broken?

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    "Most licenses available do not seem to carry any legal weight." [Citation needed] – curiousdannii Jul 5 '15 at 7:08
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    @Zizouz212 It's unclear because there's no indication whatsoever of what the OP means by "legal weight" or why the "newer" licenses (whatever they are) are "broken". – curiousdannii Jul 5 '15 at 14:16
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    @Zizouz212 Agreed in general, but if the words are being used in a way which is unclear/confusing then they do have to be clarified. Otherwise, it's "unclear what is being asked" -> close reason – kdopen Jul 5 '15 at 17:57
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    It does not appear that the question is unclear, only that it is incorrect in its assumptions. Answers can correct those assumptions. It is answers that should be backed by evidence, not questions. – trichoplax Jul 5 '15 at 20:20
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    Copyright law is what gives the various open source licenses their legal weight - they grant you certain rights you don't usually have, and put some requirements on you in exchange. Yes, this means that in a jurisdiction where there is no copyright law and everything would be in the public domain. the licenses might not have any legal weight - but anywhere outside of it, they suddenly will have that again. – Michael Schumacher Jul 6 '15 at 8:51
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You claim most licenses don't carry any legal weight. But I'm not so sure about this being true. Naturally it is hard to say, how good licenses can be enforced in court, until it happens...

And it happened already and courts enforced open source licenses.

Some examples.

GPL-Violations

The popularity and flexibility of Linux lead to the wide usage of the kernel in multiple devices, namely routers. Some of the constructors of these routers used the software in violation of the GPL. Harald Welte - developer of the netfilter/iptables - was starting to take legal action against it. His law-suits lead to acknowledgment of the GPL in court. To better defend his claims he founded an organisation named gpl-violations. Some notable wins included cases against Fortinet, D-Link and Skype because of the violation of the GPL. In these cases Welte and gpl-violations won.

gpl-violations also sided with Cybits AG in a law suit against router-producer AVM. Cybits modified the AVM firmware for some goals, and AVM was taking court-action against that. As AVM also used a Linux kernel, FSF and gpl-violations were siding Cybits AG in this case. Also in this case the GPL was acknowledged from the court: https://fsfe.org/activities/ftf/avm-gpl-violation.html

Software Freedom Law Center

Similar to the german based GPL-violations the Software Freedom Law Center enforces the GPL in the US. Notable cases here involve the BusyBox-developers against multiple developers of electronic devices that violated the terms of the license and the FSF against Cisco.

Conclusion

Open Source licenses are enforcable in court. This as always depends on the details of the case and the jurisdiction you're in, but generally the terms of open source licenses can be accepted by courts. It is possible though, that some terms are unclear or not really working in law, because of the missing knowledge of the authors about law. It is for this reason you should prefer common popular licenses (more tested in court) and licenses that are written with the consultations of lawyers.

The GPL seems the license you can be most sure it is enforcable, as that already happened multiple times with differing details in the case and in differing jurisdictions.

It is generally recommendable you look for legal help if you want to enforce the license to your work. gpl-violations as of now seems no longer in action, but in the US you can search the help of the Software Freedom Law Center, also organizations like FSF (and the european version FSFE) might be helpful in case you want to defend your rights given to you from open source software.

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