You'd call it my support too. John
Where does similarity contravene design, pattern or copyrights, is it the view of the person who considers theirs to be the sole rights to the form.
A good few years back now the Bowman that attended Yandles was fuming, Names escape me, but a follow Bowmaker had at some point during the day had strong words with him that He'd not only the express rights, but originated the Hawkshead on any Bow and this couldn't be copied by any others .. really .. not seeing Him, just how old had that gentleman been, the first Bows go back ...
..
At best should any Form in Turning be a poor copy, then is it that the claimant expresses the piece is damaging to his own reputation, now if it were the perfect copy, was it contrived for gain to be past as that persons work, it falls under being fake or a forgery, then that's more with regards to Art and Painting.
Anyone who has published a book on the subject of Turning has done so to instruct and encourage the making of given forms, shapes and designs. There are few details in Turning and these when combined together make a limited form, it's when these come together in perfect symmetry, you can't help but have a form which has been produced before and reflex on it being a Classic Form, even too and here's where it differs, in the likeness of the forms say by Bert Marsh or etc .. etc ..
The making of anything will come to an end .. if all said, it's been done already, can't have the same made again.
Cheers David