You might have a look at my discussion with the CEO here, https://news.ycombinator.com/item?id=10622760 https://news.ycombinator.com/item?id=10622760 It seems

You might have a look at my discussion with the CEO here, https://news.ycombinator.com/item?id=10622760 https://news.ycombinator.com/item?id=10622760 It seems they've completely prohibited forks effectively by prohibiting redistribution of modified versions. I'm not sure about the OSI definitions, but that definitely doesn't fit with any idea of open source I have at least. At best, I view it as a proprietary product, their source release is no more useful than say, JIRA's. At worst, it seems strangely dishonest to try to promote your product as open source using this sort of license but twist it so far that it doesn't resemble open source at all.