4.
Legislative power to reduce the Public Domain should be constrained.

The introduction of new exclusive rights should be conditioned on strict criteria based on the principle of proportionality and clear economic evidence. Should there be a clearly demonstrated need for a new exclusive right or the expansion of subject matter covered —including related or sui generis rights— the introduction should be subjected to an experiment by letting the new right expire after a predetermined number of years unless a clearly defined public interest benefit has been demonstrated.

Cropped version of Leonardo da Vinci's Vitruvian Man
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The Vitruvian Man: A Puzzling Case for the Public Domain
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