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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 the tabloid komputek)