[OSM-legal-talk] CC-BY-SA / Non-separatable combination of OSM+other

[Frederik Ramm]

Hi,

On 02/02/11 18:49, Jonathan Harley wrote:
>> For print, yes, that's about the size of it.
>
> I don't see what print's got to do with it. Any rendering, whether to
> paper or to a screen, changes the bits used

The difference is who makes the work.

If you have an image comprising two separatable layers - say, an 
OpenLayers map with a CC-BY-SA source and a proprietary source - then 
both these images are published by the people operating the servers (may 
be the same server, may be different servers).

You have two images, with different licensing, and it is *you* who 
combines them, using software that runs on *your* computer, into one 
rendering.

If *that* rendering was now published, it would certainly have to be 
CC-BY-SA (say if you make a screenshot or a print). However, the people 
you get the images from do not publish that rendering; they publish two 
distinct images, licensed differently, which is totally ok.

That's the difference between print (where the image is already combined 
for you, and published in combined form) and a layered web application 
(where it is you, through certain instructions you give to software 
running on your machine, who creates the derived work by superimposing 
the images).

Bye
Frederik