From the Eigen Licensing FAQ
(http://eigen.tuxfamily.org/index.php?title=Licensing_FAQ):
> Eigen is dual-licensed: at your choice,
> * either under the LGPL, version 3 or later,
> * or under the GPL, version 2 or later.
>
> Note that this is an OR, not an AND. You do not need to conform to both
> licenses, you just pick the one that you prefer.
For MADlib, Eigen is licensed under GPL version 2.
This product may be distributed with open source code, licensed to you in
accordance with the applicable open source license. If you would like a copy of
any such source code, EMC will provide a copy of the source code that is
required to be made available in accordance with the applicable open source
license. EMC may charge reasonable shipping and handling charges for such
distribution. Please direct requests in writing to EMC Legal, 176 South St.,
Hopkinton, MA 01748, ATTN: Open Source Program Office.
