[eigen] tvmet: licensing question for a project based on tvmet source code

[Benoît Jacob <jacob@xxxxxxxxxxxxxxx>]

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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