|[eigen] tvmet: licensing question for a project based on tvmet source code|
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Hello Olaf, I'm developing a software project, Eigen2, that is based on tvmet 1.7.1 source code. To be precise, Eigen2 is a C++ template library for linear algebra, and many of its own source files are taken from tvmet. In a sense, you could say it's a "fork" of tvmet, but in a very positive sense. I am mixing together code from three different existing libraries (tvmet, eigen1, gmm++) in order to hopefully create an even better linear algebra library. I am writing this to ask for your confirmation that I am allowed to redistribute Eigen2 under the plain unmodified GNU LGPL license. I have seen that tvmet has an addendum to the LGPL. This addendum contains an advertising clause (Clause 5). I want to redistribute Eigen2 without any advertising clause. I _will_ advertise tvmet very generously on the Eigen website and documentation. Actually, I am already advertising tvmet on Eigen's website (eigen.tuxfamily.org). But while _I_ am perfectly fine with advertising tvmet, I don't want to force _Eigen's users_ to do so. Advertising clauses also lead to many licensing problems on which I could elaborate. As far as I can see, it isn't said anywhere that the addendum itself must be kept in derivative works. So there are chances that I didn't even need to write this e-mail. However, there are also chances that I do need your confirmation, so I would feel relieved to read back from you. Cheers, Benoit Jacob
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