My understanding (correct or incorrect?) was that a design patent prevented others from importing, manufacturing, using or selling the patented design for the period of the patent. For me this gave explanation to the Barcelona and Le Corbusier designs on the market (usually sold under a different name to the original design).
Lately, however, I have noticed copies of designs such as Marcel Wanders' 2007 'Skygarden' Pendant for Flos Lighting and Tom Dixon's 2006 Beat lighting range. I have even seen a copy of Front's 2006 'Horse Lamp' for Moooi.
In Australia, a new industry collective, Authentic Design Alliance, have formed to support the integrity of original and authentic design.
What is your opinion of original design over copies?