The team quickly came to the conclusion that in order to keep Dolphin relevant in an ever-changing environment, it would need to be relicensed under GPLv2+. This would give Dolphin some much needed freedom to breathe within the open source landscape. As such, relicensing formally began in September of 2014.
A massive undertaking.
The default GPL2 licence was what we call GPL2+, it was only when people specifically modified it to not include the “or later” phrase that it became GPL2-only, and now they are experiencing why the phrase were there, and why they were idiots for removing it.