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GPL clearly explains that there is no warranty for
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this free software. For both users' and authors'
sake, the GPL requires that modified versions
be marked as changed, so that their problems
will not be attributed erroneously to authors of
previous versions.
Some devices are designed to deny users access
to install or run modified versions of the software
inside them, although the manufacturer can do
so. This is fundamentally incompatible with the
aim of protecting users' freedom to change the
software. The systematic pattern of such abuse
occurs in the area of products for individuals to
use, which is precisely where it is most unaccep-
table. Therefore, we have designed this version
of the GPL to prohibit the practice for those
products. If such problems arise substantially in
other domains, we stand ready to extend this
provision to those domains in future versions of
the GPL, as needed to protect the freedom of
users.
Finally, every program is threatened constantly
by software patents. States should not allow pa-
tents to restrict development and use of software
on general-purpose computers, but in those
that do, we wish to avoid the special danger that
patents applied to a free program could make it
effectively proprietary. To prevent this, the GPL
assures that patents cannot be used to render the
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