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the stub imbedded in your compressed program must be byte-identical
to the stub that is produced by the official unmodified UPX version.
3. The decompressor and any other code from the stub must exclusively get
used by the unmodified UPX stub for decompressing your program at
program startup. No portion of the stub may get read, copied,
called or otherwise get used or accessed by your program.
ANNOTATIONS
===========
- You can use a modified UPX version or modified UPX stub only for
programs that are compatible with the GNU General Public License.
- We grant you special permission to freely use and distribute all UPX
compressed programs. But any modification of the UPX stub (such as,
but not limited to, removing our copyright string or making your
program non-decompressible) will immediately revoke your right to
use and distribute a UPX compressed program.
- UPX is not a software protection tool; by requiring that you use
the unmodified UPX version for your proprietary programs we
make sure that any user can decompress your program. This protects
both you and your users as nobody can hide malicious code -
any program that cannot be decompressed is highly suspicious
by definition.
- You can integrate all or part of UPX and UCL into projects that
are compatible with the GNU GPL, but obviously you cannot grant
any special exceptions beyond the GPL for our code in your project.
- We want to actively support manufacturers of virus scanners and
similar security software. Please contact us if you would like to
incorporate parts of UPX or UCL into such a product.