This version of unzip is a stripped-down version which doesn't include the "unreduce" and "unshrink" algorithms. The first one is subject to a restrictive copyright by Samuel H. Smith which forbids its use in commercial products; and Unisys claimed a patent ("Welsh patent") on the second one (while their licensing would seem to mean that an extractor-only program would not be covered). Since the rest of the code is copyrighted by Info-Zip under a BSD-like license, this Mandrake package is covered by this license. Please note that currently, default compilation of the Info-Zip distribution also excludes the unreduce and unshrink code. Please contact MandrakeSoft at <bugs@linux-mandrake.com> if you have any problems regarding this issue.