What's funny is that Hancom is essentially arguing that shrink-wrap licenses (contracts) are unenforceable. Ghostscript was open sourced under the GNU GPL which states, in shrink-wrap fashion, that use of the software without an explicit commercial license binds the user to the GNU GPL. Integrated the software into their own closed-source software and distributing said closed-source software is unquestionable use.
At the same time, you can guarantee that Hancom would fully enforce their own shrink-wrap licenses - Terms of Use, Terms of Service, etc. - on others.