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From Niclas Hedhman <nic...@hedhman.org>
Subject Re: Help with Dependency Licensing
Date Wed, 12 Apr 2017 00:29:19 GMT
On Wed, Apr 12, 2017 at 12:31 AM, Mike Jumper <mike.jumper@guac-dev.org>
wrote:

>
> Even in the case of the GPL, my understanding is that the virality takes
> hold upon linking (at build time), not upon referencing the API via an
> import, include, etc. in the source.
>

Your understanding is, simply put, not aligned with the FSF, and the ASF
has decided to follow FSF's conclusion. In fact, a former Director at ASF
and lawyer, Larry Rosen, was trying to fight this stance, basically making
the claim that GPL is overreaching, and that ended with Larry being kicked
out (not only for this particular question).


<quote src="http://www.gnu.org/licenses/lgpl-java.html" emphasis="mine">
It has always been the FSF's position that *dynamically linking
applications to libraries creates a single work derived* from both the
library code and the application code.The GPL requires that all derivative
works be licensed as a whole under the terms of the GPL, an effect which
can be described as “hereditary.” So, if an application links to a library
licensed under the GPL, the application too must be licensed under the GPL.
 :
 :
FSF's position has remained constant throughout: the LGPL works as intended
with all known programming languages, including Java. Applications which
link to LGPL libraries need not be released under the LGPL. Applications
need only follow the requirements in section 6 of the LGPL: allow new
versions of the library to be linked with the application; and allow
reverse engineering to debug this.
</quote>

At first, the "link to LGPL libraries need not be released under LGPL" is
an indicator that Apache licensed projects could depend on LGPL projects,
but it is this "Section 6" that makes LGPL incompatible, since we don't
require this of our downstreams. This was hotly debated back in the days
when this FSF article was written, and it took us a year or two to nail it
down.


More info at http://www.gnu.org/licenses/gpl-faq.html

John, As for the case of Hibernate; If you depend on JPA, you don't depend
on Hibernate. However, if you depend on JPA in a way so that only Hibernate
makes the project work, and that EclipseLink or other implementations can't
be used instead, then you are in gray territory and should ask Legal for
advice. I am uncertain of that position.


Cheers
-- 
Niclas Hedhman, Software Developer
http://polygene.apache.org - New Energy for Java

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