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From: Felix Cheung <felixcheung_m@hotmail.com>
To: "dev@mxnet.incubator.apache.org" <dev@mxnet.incubator.apache.org>,
	"dev@mxnet.incubator.apache.org" <dev@mxnet.incubator.apache.org>
Subject: Re: Rcpp licensing in Apache MXNet
Thread-Topic: Rcpp licensing in Apache MXNet
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Re this

The Spark R package includes "R.h" and "Rinternals.h", which are both LGPL =
(
https://github.com/apache/spark/blob/master/R/pkg/src-native/string_hash_co=
de.c#L24-L25
).

This is actually disabled - it is not getting built and it is not in the re=
lease - because the way SparkR is packaged in Spark release we haven't figu=
red out how to release cross multiple platforms.

(I'm one of the main contributor to SparkR)

________________________________
From: Henri Yandell <bayard@apache.org>
Sent: Friday, July 7, 2017 12:02:16 AM
To: dev@mxnet.incubator.apache.org
Subject: Re: Rcpp licensing in Apache MXNet

We should bring this up on general@incubator or legal-discuss@.

On Thu, Jul 6, 2017 at 10:59 PM, Qiang Kou <qkou@umail.iu.edu> wrote:

> Really thank you for the clearance.
>
> From the link you provided,
>
> "However, if the component is only needed for optional features, a projec=
t
> can provide the user with instructions on how to obtain and install the
> non-included work."
>
> I think this is exactly our case. We provide instructions on how to insta=
ll
> GNU R and the Rcpp package.
>
> Besides, our case is very similar with Spark.
>
> The Spark R package includes "R.h" and "Rinternals.h", which are both LGP=
L
> (
> https://github.com/apache/spark/blob/master/R/pkg/src-
> native/string_hash_code.c#L24-L25
> ).
>
> Best wishes,
>
> Qiang Kou
>
> On Thu, Jul 6, 2017 at 6:09 PM, Felix Cheung <felixcheung_m@hotmail.com>
> wrote:
>
> > I'm not the authority on this but a release from an ASF project is
> > different from releasing with the Apache 2.0 license.
> >
> > You can find more out this here
> > https://www.apache.org/legal/resolved.html#optional
> >
> > Specifically, quote:
> > "Optional means that the component is not required for standard use of
> the
> > product or for the product to achieve a desirable level of quality."
> >
> > Basically my interpretation is that if an ASF project cannot function
> > without a component, then it is required and such required component
> cannot
> > be one of the prohibited licenses.
> >
> > https://www.apache.org/legal/resolved.html#category-x
> >
> > Probably a good idea to start a thread with legal@ if there are more
> > questions.
> >
> > _____________________________
> > From: Qiang Kou <qkou@umail.iu.edu<mailto:qkou@umail.iu.edu>>
> > Sent: Thursday, July 6, 2017 3:41 PM
> > Subject: Re: Rcpp licensing in Apache MXNet
> > To: <dev@mxnet.incubator.apache.org<mailto:dev@mxnet.
> incubator.apache.org
> > >>
> >
> >
> > Hi, Felix,
> >
> > I just want to make sure there is no misunderstanding between us.
> >
> > (1) The MXNet R package heavily used the Rcpp package, but we only
> include
> > the
> > header file, Rcpp.h, like https://github.com/dmlc/mxnet/
> > blob/master/R-package/src/base.h#L11
> >
> > The MXNet R package doesn't contain any source code from Rcpp and there
> is
> > no linking against Rcpp.
> >
> > (2) There is "LinkingTo: Rcpp" in the R package description (
> > https://github.com/dmlc/mxnet/blob/master/R-package/DESCRIPTION#L32).
> > However, this only means we want to use the header files from Rcpp.
> >
> > "A package that wishes to make use of header files in other
> > packages needs to declare them as a
> > comma-separated list in the field =91LinkingTo=92 in the DESCRIPTION fi=
le. "
> >
> > More details can be found from R's official manual (
> > https://cran.r-project.org/doc/manuals/r-release/R-exts.
> > html#Package-Dependencies).
> >
> > (3) Many R packages who use Rcpp to communicate with C++ have been
> released
> > under Apache License, like feather (https://github.com/wesm/
> > feather/blob/master/R/DESCRIPTION).
> >
> > Best,
> >
> > Qiang Kou
> >
> > On Thu, Jul 6, 2017 at 1:20 AM, Felix Cheung <felixcheung_m@hotmail.com=
<
> > mailto:felixcheung_m@hotmail.com>>
> > wrote:
> >
> > > On a related note, Rcpp, used extensively in the R package, is
> > GPLv2/GPLv3
> > > licensed.
> > >
> > > I'm not aware of any other R package available that supports R<->C++.
> > >
> > > https://www.apache.org/legal/resolved.html#category-x
> > > https://cran.r-project.org/web/packages/Rcpp/index.html
> > >
> > >
> >
> >
> >
>
>
> --
> Qiang Kou
> qkou@umail.iu.edu
> School of Informatics and Computing, Indiana University
>

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