[MapProxy] CC-BY-SA AccessConstraints in documentation & tests

[Sebastiaan Couwenberg]

On 08/03/2016 10:57 PM, Simon Poole wrote:
> Now while it is obviously a misunderstanding given that the message
> doesn't have anything to do with the code licence  CC by-SA 2.0 is
> clearly compatible with the open definition, so it is not quite clear
> what the issue is supposed to be even -if- it was the code licence.

The issues with CC-BY licenses are been documented here:

http://web.archive.org/web/20140805044520/http://evan.prodromou.name/ccsummary/ccsummary.html

The anti-DRM provisions and requirement that downstream users remove an
author's credit upon request from the author, are considered DFSG non-free.

Only CC-BY-SA >= v3 is compatible because it addresses those concerns, see:

https://wiki.debian.org/DFSGLicenses#Creative_Commons_Attribution_Share-Alike_.28CC-BY-SA.29_v3.0
https://en.wikipedia.org/wiki/Creative_Commons#Criticism

Kind Regards,

Bas

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