I'll repeat again that whether or not a script was "published" has no bearing whatsoever on whether that script is infringing copyright. I'm not sure why we keep discussing publication - but if I am missing something, I apologize and please let me know.
That being said, here is the official legal definition for "publication" under U.S. Copyright law.
'To publish a work is to distribute copies or phonorecords of the work t
o the public by
sale or other
transfer of ownership, or by
rental, lease, or lending. Publication also includes offering to distribute copies or phonorecords to a group of persons for purposes of
further distribution, public performance, or public display. A public performance or display of a work does not of itself constitute publication.'
http://www.copyright.gov/help/faq/definitions.html