license: state it's GPLv2

The code comes from the Linux kernel source tree, which is GPLv2
(unless otherwise stated).

Quote Linus' clarification from the COPYING file in the Linux
kernel source tree; add my own interpretation blurb.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

diff --git a/COPYING b/COPYING
index 3912109b5cd65a68039d473c11c9f7ac2303e06d..828506f762dbfd5e16fcca09062b4525adedfce6 100644 (file)
--- a/COPYING
+++ b/COPYING
@@ -1,3 +1,20 @@
+
+The kconfig parser and frontends are extracted from the Linux kernel
+source tree, which is covered by the GPLv2 only. As Linus Torvalds puts it:
+
+ > Also note that the only valid version of the GPL as far as the kernel
+ > is concerned is _this_ particular version of the license (ie v2, not
+ > v2.2 or v3.x or whatever), unless explicitly otherwise stated.
+
+Although the above quote explictly mentions the Linux kernel, it is my
+understanding that the whole Linux kernel source tree is covered by this
+sentence, even non-kernel source code. As such, the license that applies
+to the kconfig parser and frontends, as published in this package, are
+also covered by this sentence, and available under the GPLv2, and not any
+other version of the GPL, unless otherwise stated.
+
+----------------------------------------
+
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991