Interesting article for discussion. My initial response, tho, is of course from an American unfamiliar with Commonwealth copyright laws:
When a poem or other work of writing is published, it is reproduced, whether it be dozens or thousands of times. It is fairly uncommon to make multiple recordings of the same performance [say, the same performance artist performing the same piece in the same venue] for purposes other than picking "the best" and further reproducing that one. As for the photographs published, I would very much object to a creative photo published multiple times in different "little magazines." But of course there are image labs always, and collections of stock footage, the resource of the postmodernist, the person on a slim budget, and the lazy.
"Like" publication: Literary works are or can published many times, but generally are published in different sorts of publications. For example, a poem might be published in a literary magazine (first north american serial rights), a newspaper or general audience magazine, an anthology or thematic issue of a literary magazine (or several), a book of poems, and a "selected" or "collected" book of poems.
Copyright Law & Residuals: Copyright law generally allows for controls on reuse and offers opportunities for income from selling rights, options, and archival materials, while residuals (which are far more lucrative) accrue from re-airing recordings. Thus, while the copyright to the Peter Pan story is owned by an orphanage in London, every time any version of "Peter Pan" is aired, the orphanage gets a small amount of money.