Licensing kernel modules

As is well known, the Linux kernel code base itself is licensed under the GNU GPL v2 (aka GPL-2.0; GPL stands for General Public License), and as far as most people are concerned, will remain that way. As briefly mentioned before, in Chapter 4, Writing Your First Kernel Module – LKMs Part 1, licensing your kernel code is required and important. Essentially, what the discussion, at least for our purposes, boils down to is this: if your intention is to directly use kernel code and/or contribute your code upstream into the mainline kernel (a few notes on this follow), you must release the code under the same license that the Linux kernel is released under: the GNU GPL-2.0. For a kernel module, the situation is still a bit "fluid," shall we say. No matter, to engage the kernel community and have them help (a huge plus), you should, or are expected to, release the code under the GNU GPL-2.0 license (though dual-licensing...