this post was submitted on 12 Jan 2024
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This is incorrect. The distributor of derivative works in binary form is responsible for providing the source code. They can refer to a server operated by a third party, but if that third party stops providing the source code the distributor remains obligated to ensure that it is still available. The only exception is for binaries which were originally received with a written offer of source code, where the offer can be passed on as-is, but that only applies for "occasional and non-commercial" distribution which wouldn't work here.
Can you point to the section of the LGPL that describes what you're claiming?
Section 6 of the GPLv3, which the LGPLv3 includes by reference as one of the required distribution terms in paragraph 4.d.0:
(emphasis added) There is the alternative of following 4.d.1 instead, but that's only if the application links against a shared library already present on the user's computer system—it couldn't be distributed with the program.
GPLv3 section six offers five alternative methods of satisfying the obligation to provide source code. The first (6.a) applies only to physical distribution and must include source code with the physical media. The second (6.b) also requires physical distribution plus a written offer to provide the source code to anyone possessing the object code. The third (6.c) is the one I mentioned that applies only "occasionally and noncommercially" for those who received a written offer themselves under the previous clause. The fourth option (6.d) allows for the source to be provided through a network server:
The fifth and final alternative (6.e) pertains to object code provided through P2P distribution, with the same requirements as the fourth method for the source code.
Section A in section 3 of the LGPL is the out here for unity:
As long as there is prominent notice with the distribution of the plugin, unity doesn't need to distribute the source code.
You mean "3. Object Code Incorporating Material from Library Header Files."? That section 3? I think they're using a bit more than just header files. Section 4 "Combined Works" is the one that applies here.
Also even if section 3 did apply they'd need to follow 3.b as well as 3.a and include the full text of both the GPL and the LGPL.