If the original author posted the script without any limitations then it would
follow that you would be free to post the rendered result. Of course it would
still be courteous and respectful to attempt to contact the author for
permission. After performing due diligence (which you have) without success you
could follow this protocol: Post your notice of intent to publish the derived
work along with a complete description of the original and a date you intend to
publish the animation. Allow at least thirty days. Provide your own contact
information. If you do not receive an objection from the author by the stated
date, post the animation.

Regards,
Dave Blandston

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