When Cumulus started using Highcharts it was free to use for non-commercial applications which includes most of our hobby web sites.
I contacted Highcharts about this and after a number of emails back and forth the result is:
- Cumulus MX itself does not require a licence as it is free and open source - normally applications would require an OEM licence
- You, the end users do each require a licence. Most of you will qualify for a free Personal Use licence.
This situation is very unsatisfactory to say the least.
I see that we have three ways forward with this:
- Carry on as we are, and all users of Cumulus MX must apply for personal licences
- Investigate the possibility of using an old version of Highcharts that was covered by the old licensing terms. I have no idea if this is possible, and if the old terms allowed Highcharts to retrospectively apply the new terms to old versions.
- Replace Highcharts with another charting product that does allow free usage. This would potentially be a huge piece of work.