[eigen] Eigen and GPL

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Hi everybody,

I have already read the thread "MPL2 is really compatible with GPL/LGPL", yet I am still unsure about how to proceed.

I want to use Eigen (and only Eigen) within a GPL 2 licensed software, which has been available for a long time and we cannot change the license (or "extend" it).

According to http://www.mozilla.org/MPL/2.0/FAQ.html Q14 requirement 1 is met by Eigen. However, we are not yet using any other GPL licensed third party library, therefore I am not sure if we fulfill requirement 2.

My questions are:

1. Can I combine Eigen within my GPL 2 software?
2. Do I have to change/modify my license?
3. How do I meet requirement 3 of Q 14 (MPL/FAQ)?
4. Do I have to add a license file (as in Eigen COPYING.*)?

Please note I am not intending to modify any of the Eigen source code and would really love to use this library within my software.

Thanks for your help,

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