add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/COPYING
..
..
@@ -16,3 +16,5 @@
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 	Documentation/process/license-rules.rst
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 for more details.
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+
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+All contributions to the Linux Kernel are subject to this COPYING file.