Information

that the provisions of his distribution
did not permit to increase the limitation
of the additional limitation, if
distributed or modified that software.

Software free non-compyfeled, was made
by his manufacturer who permitted us to
distribute and modified but also to add
additional limitations of the depth.

Softaware GPL-Covered, GNU GPL (the General public License)
was a provisions collection of the certain distribution to
copyleft a program. Project GNU used him as the distribution
agreement for most software GNU.

Software semi free, was software that was not free, but
permitted anyone to use, copied, distributed (including the
distribution from the version that was modified)and
modification for the aim of the non profit.

Software public the domain, was software that without the
copyright. This was the special case from software free non-
copulefted, it was significant that several copies or the
version that were modified could become not completely free.

Software copylefted was software free that the provisions
of his distribution did not permit to increase the limitations.
if distributed or modified software this meaning that each
copy software although being modified, must was software free.

(taken from tabloid komputek)