Since you mention looking on Wikipedia for more info on SageMathCloud, just 
thought id let you know that William writes about SageMathCloud on his Sage 
blog at: http://sagemath.blogspot.com/ , in case you hadn’t come across it. 
As it has a lot of information about SMC.

On Friday, August 15, 2014 1:42:14 AM UTC-7, Dr. David Kirkby (Kirkby 
Microwave Ltd) wrote:
>
> As I understand it, the SageMathCloud is closed source. Yet it is 
> making extensive use of open-source code. Maybe the closed source bits 
> don't link to the open-source bits, though I find it a bit hard to 
> believe. If it did not link, it would not that be against the GPL? Or 
> I guess if the code is not distibuted, but only kept on a server, it 
> probably gets around the GPL. 
>
> If not against the GPL, this certainly seems to be going against the 
> *spirit* of the Sage project. It looks as though the intention is to 
> charge for access to a web service which makes use of open-source code 
> developed by many - myself included. 
>
> One might argue it is the same with any web service making use of 
> Apache for example, although I still think a closed-source 
> SageMathCloud is pushing the limits of what some (myself included), 
> find morally acceptable. 
>
> The only comment on the Wikipedia talk page 
>
> http://en.wikipedia.org/wiki/Talk:SageMathCloud 
>
> says "Unfortunately, some part of it is becoming closed source. And, 
> they will charge for the many of the services..." I don't know who 
> wrote that, but it was not me. 
>
> Maybe it is legal. I don't think it is morally right. 
>
> Dave 
>

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