> Furthermore it is profoundly curious to claim that a cross platform filesystem that began life on Solaris and existed for years as a stable complete work befo

> Furthermore it is profoundly curious to claim that a cross platform filesystem that began life on Solaris and existed for years as a stable complete work before being ported to several OS including Linux becomes by virtue of a bridge a derivative work of Linux. It's magical thinking. It's not magical thinking. A work can be a derivative of multiple other works. It's completely plausible that adding Linux stuff to ZFS can make it a derivative work of Linux in addition to being a derivative work of whatever else it is already a derivative work of. There's room for debate about how much Linux stuff (and of what nature) something like ZFS can incorporate before it becomes a derivative work according to copyright law and the GPLv2, but you cannot dismiss the idea outright.