The current implementation is'nt heavily based on Highcharts, so switching 
to another JavaScript Charting Library wouldn't cause much pain and seems 
to be the best option right now.
I choose Highcharts in the first place because I've had already experience 
in using it. But now I will look into some other Charting libraries.

Anyway, thank you all for your input in this "licensing matter" ;)

@ Tom Fennelly:

I already took a closer a look at Google Charts. One thing that I didn't 
like is that you're not allowed to host the Google Chart Library on your 
own server. So the plugin users must always have a working internet 
connection (maybe in some company intranets that may not be the case).

Cheers
Michael


Am Mittwoch, 25. November 2015 13:47:45 UTC+1 schrieb nigelm:
>
> I don't follow how an OEM license would work with an open-source project. 
>
> What if I fork the plugin - license still valid? 
> What if I make changes in that (forked) plugin - license still valid? Even 
> if the fork isn't public?
> What if those changes are entirely to serve my own proprietary / 
> commercial interests? What about if they're entirely to serve a 3rd party 
> commercial interests?
>
> The whole thing ends up being a tarpit. An OEM license still ends up being 
> a 'non-free' license (it'll impose restrictions covering the above usecases 
> and more). 
>
> On Wed, Nov 25, 2015 at 12:20 PM, Ullrich Hafner <[email protected] 
> <javascript:>> wrote:
>
>>
>> Am 25.11.2015 um 11:27 schrieb Nigel Magnay <[email protected] 
>> <javascript:>>:
>>
>> The concern isn't the "Jenkins Project" - that's non-profit and can use 
>> it at will. It's the *end users*. Their FAQ claims:
>>
>> NON-COMMERCIAL REDISTRIBUTION.
>>
>> You are allowed to distribute a Highsoft software product with 
>> non-commercial packages given that you fulfill two conditions:
>>
>>
>>    - Emphasize to your users that a Highsoft software product is not 
>>       free for commercial use. You can do this on your download page or when 
>> your 
>>       users activate a Highsoft software product in your application.
>>       - Provide a link back to this web page in the same location.
>>    
>> That not what I asked. I would like to know how much a OEM license would 
>> cost for a community project like Jenkins. With a OEM license you *can* use 
>> the plug-ins without additional cost.  
>> It would not hurt us to ask. 
>>
>>
>> Whether you can use a (CC BY-NC 3.0) in your commercial organisation is 
>> entirely determined on whether you are gaining "commercial advantage" by 
>> doing so. I would argue that for most plugins and companies this is not the 
>> case. But assuredly that would be a matter for lawyers.
>>
>>
>>
>> On Wed, Nov 25, 2015 at 10:10 AM, Ullrich Hafner <[email protected] 
>> <javascript:>> wrote:
>>
>>> Wouldn’t it make sense to ask what a commercial license would cost for 
>>> the Jenkins project so that users of Jenkins don’t need to bother about the 
>>> license at all? 
>>>
>>> Am 25.11.2015 um 10:59 schrieb Nigel Magnay <[email protected] 
>>> <javascript:>>:
>>>
>>>  
>>>
>>>> (unintentional) violation of the license by end users.
>>>>
>>>>
>>> ​Oh, it will be.
>>>
>>> You're asking an awful lot of end-users to be going through plugin 
>>> detail (the vast majority are entirely unencumbered by transitive licensing 
>>> issues) to determine if they're 'allowed to use it' or not. They're just 
>>> not going to bother. If I were Highcharts, and the license *really*​ is 
>>> down to the 'commercial-ness' of the *end user* rather than the ISV 
>>> producing the component (which is more normal), I would not be happy and I 
>>> might choose to pursue *you* for not enforcing this license term.
>>>
>>> ​IMO, plugins that have terms like that should not belong in the public 
>>> repository at all.​
>>>
>>>  
>>>
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