I think I might have a misunderstanding of free software licenses, or then again I might not.
I am a somewhat frequent contributor to library "x", which is a fork from library "y". Both are licensed LGPL v2.1. We make it pretty clear that our work is a derivative from the original; basically that our library is a set of patches over the most current version of the original library. We also still have the original copyright notices in each file for the original authors of each file.
Recently I discovered that of course the original project is taking a lot of our changes back up into their code. They have not given any attribution of any kind of that their code includes code from our project. Doesn't this constitute a violation of the LGPL? Even permissive licenses like the BSD licenses require you to keep the original author's copyright notice intact, giving some attribution.
I'm not looking to sue or anything, but this original library is owned by a commercial entity. If other people are going to make money off my bugfixes and contributions, I at least want some attribution for it.