[Proj] ICSM (Australia) transformation file licensing

[Sebastiaan Couwenberg]

On 01/18/2017 01:01 AM, Alex Leith wrote:
> I'm working with ICSM to incorporate Australian ntv2 grids into open source
> software. There are two existing GSB files, and there will be another soon
> for the new GDA2020 datum. ICSM are able and prepared to license the files
> in any way.
> 
> I'd like to know what license to apply to these files in order to best
> enable their inclusion into Proj4 and other projects?

The NTv2 grids already included in the proj-datumgrids distribution are
in the public domain. Creative Commons CC0 is a better choice than PD
because it covers more jurisdictions.

The license for the Australian grids needs to be compatible with the
terms of the GPL-2+ to allow other projects (PostGIS specifically) to
include it too.

Please don't disallow modification of the correction values like EPSG
and many other national grids following their lead, those terms are
incompatible with the GPL-2+.

Kind Regards,

Bas

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