must carry a stamp of approval by the authorities (against copyright infringments)
I almost can't believe that software products require approval by authorities to be put on the market.
It's not a stamp of approval. It's something you buy (and it costs you a few hours at least, hours you must re-spend for every different program you have).
It's not to put it on the market. It's to use for "revenue purposes". My own software tools I use to accomplish my work must be stamped even if I'm using them in my house.
See the siae.html published by softwarelibero.org for more information (available in Italian and English (in slightly reduced form))
/alessandro, who's acting against the law like any software author in Italy.