Hi Kieran On Sun, Aug 24, 2025 at 07:53:45AM +0100, Kieran Kunhya via ffmpeg-devel wrote: > On Sat, 23 Aug 2025, 21:33 Michael Niedermayer via ffmpeg-devel, < > ffmpeg-devel@ffmpeg.org> wrote: > > > Hi > > > > Here is the legal advice that i was given. > > The GA has the full text and that is much more detailed. > > Iam posting the relevant parts so the whole community can see it. > > > > "a claim that there is GPLv2 code in a file of > > FFmpeg origin that has the LGPLv2.1 license would be a breach of the > > FFmpeg's > > LGPLv2.1 license. While section 3 of the LGPLv2.1 would have allowed him > > to > > take the original FFmpeg files and change the license for them to GPLv2, > > he > > didn't follow the necessary steps to effectively change the license. So > > the > > original code he is building from is still under LGPLv2.1. Since code > > contributions to a copyleft work have to be under the /same /license as > > the > > code you are contributing to (Section 2(c), "You must cause the whole of > > the > > work to be licensed at no charge to all third parties under the terms of > > this > > License"), Paul's contributions to LGPLv2.1 files are under the LGPLv2.1 > > license because he didn't exercise the option to change them to GPLv2 > > first. A > > claim otherwise would be admitting he is in breach of the FFmpeg license." > > > > "You can safely assume that any new file he created with a license > > identifier in the file of LGPLv.2.1 is under the LGPLv2.1 license." > > > > "Paul's response to your use of his code may be to relicense his code under > > the AGPL,* but he cannot change the license retroactively - you would > > have to > > accommodate the AGPL license for any later changes you adopt, but not for > > any > > code you are using from before a license change." > > > > thx > > > > [...] > > > > Can you confirm the FFlabs lawyer said something different?
I cannot confirm this. I dont remember ever seeing the reply or the question. My communication with the FFlabs lawyer was through a intermediary developer, who was very busy and the mails where also terse IIRC i also had to ask multiple times to get any awnser > And so you went > to another one until you got the answer you wanted? [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB No human being will ever know the Truth, for even if they happen to say it by chance, they would not even known they had done so. -- Xenophanes
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