Subject: Re: which license to use for software using components with GPL, LGPL and EPL?
From: John Cowan <>
Date: Mon, 31 Aug 2009 16:25:36 -0400

Ian Vernon scripsit:
> >The first thing to do is talk to a lawyer.  The GPL and EPL are not
> compatible but the communities also have different ideas of when the
> licenses matter.  The fact of the matter is that >there are big questions
> regarding WHEN the GPL requires that a component is under the GPL as well.
> Thanks. So far in the industry I have seen EPL components on LGPL published
> software but all are derivative works. Is there no compatibility issues
> between LGPL and EPL?

There are not, provided you keep the LGPLed parts and EPLed parts in
separate files, and make sure to obey the restrictions of both licenses.
It's a big mistake to think that open-source software is there for you
to use however you want.  There are conditions, and you must obey them.

I am not a lawyer; this is not legal advice.

John Cowan
Most languages are dramatically underdescribed, and at least one is
dramatically overdescribed.  Still other languages are simultaneously
overdescribed and underdescribed.  Welsh pertains to the third category.
        --Alan King