The copyright rules have changed. Registration and a proper notice was required when this film was published.

Now, fixing a creative work in a tangible medium is all that's required. When does the copyright expire? Nobody will know, because there's no year of publication listed, and no author listed to find out when they die. (Even if there is an author listed by name, maybe it was me; maybe it was the Pulitzer Prize winning author)

99.9999999% of software written is not published, it’s covered by trade secret law. Copyright only applies to published works. Look into what happens legally when source code is leaked and published.