> 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. please don't confuse the source code and the resulting binaries. to the extent that the zsh source code does not derive from Linux, it is not a derivative work. but the binaries built for Linux will necessarily be derivative of both. and we regularly redistribute binaries; this indeed is what Linux distributions ordinarily do. if you only write the bridging code and/or distribute the module source, you may be quite protected. but if you distribute a patch from the mainline to include zsh, or a mixed tarball of Linux+zsh, or even compiled Linux kernels complete with a loadable zsh module, you may be in breach. all of these clearly derive from multiple sources with incompatible licences.