> Solution: /proc/sys/kernel/tainted. Set to 0 on boot, set to 1 by
> insmod when it finds a non-GPL module, printed by panic, extracted by
> ksymoops. Any load of a proprietary module taints the kernel, even if
> it is later removed. The kernel code for that sysctl only allows taint
> to be set, not to be cleared.
The LGPL, X11, and 2-clause BSD licenses shouldn't set the tainted flag.
Perhaps the licenses should simply be listed.
$ cat /proc/sys/kernel/licenses
GPL
Public Domain
unknown
BSD(2)
Microsoft-EULA-v666
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