Norwegian to English Bus/Financial IT (Information Technology)

The art of making multiple copies, as in "Når samme melding skal sendes til flere adressater, kan vi mangfoldiggjøre den, og videreformidle den til flere mottakere."
The term is also used for multiply, as in "Go forth and multiply" (the original sense, not the recent one of eff off).
I am also looking for the noun for mangfoldiggjøring. This is commonly found in copyright statements as one of the many things you cannot do to a proprietary document. Had it been just two, I'd have used to duplicate and duplication; multi- doesn't work well here.