> depends what you mean by solid legal ground then
I'm referring to having confidence that using OpenJDK, in the absence of any licensing agreement with Oracle, will not land your company in legal trouble.
I'm not seeing an ambiguity in my use of solid legal ground.
> Nobody is / should be seriously concerned by using the open source OpenZFS modules with their Linux distro of choice.
Linus isn't convinced that it's legally safe to do this, and neither are some people in this thread, myself included.
It may be true that even Oracle are unlikely to go after you for using ZFS from Linux, but if it's not safe enough for Linus, it's probably not safe enough for the legal departments of large companies.
Nobody is / should be seriously concerned by using the open source OpenZFS modules with their Linux distro of choice.