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modify it.
For the developers' and authors' protection, the GPL clearly
explains that there is no warranty for 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 unacceptable. 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 patents 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
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