wossobama, as im sure you know copyright laws are a highly complex area of law, and using the comparison of a book to demonstrate a misunderstanding of what i have said is not suitable in this situ. I think you will find that in product design the same design can be used and little things used to differentiate this rear valance, as an example a small item such as mounting points can be different and therefore the product is not the same, and in not attempting to label the product as Autodelta they are a standalone product. If you wish to compare it with other products and not literature which would be plagiarism in your interp. Lets say Lemonade or cola! Cocacola does not have exclusive right to manufacture cola!
Nor Xerox Photocopiers.
Firstly, copyright does not apply to 'items' - it applies to literary dramatic musical or artistic works, sound recordings / films or typographical arrangements of published works. Any copyright that would exist in anything to do with the valance would be on the paper / electronice designs of such valance and not the item itself. You never see an item with the (c) logo stamped on it do you?
Secondly, if Coca Cola or Xerox have any aspect of their cola or photocopiers protected by IP rights, such as a patent, trademark or design right, that aspect cannot be copied! If Xerox had managed to get IP rights over the whole concept of a photocopier, then the could take action against anyone who created another photocopier.
Your rationale, that changing the mounting points would render the valance sunbstantially different to AD's product is nonsense! If the valance was then fitted, you would not see any difference at all. Also, by your reasoning, any IP rights could be gotten around by changing some small insignificant detail! Does that mean you could create your own Dyson vacuum simply by changing the dimensions and connection points of the various components? I think not...
As I said previously, the measure is qualative rather than quantative. You could change as many small different aspects of the product as you like, but if the end result still bears enough of the protected aspects of the original, it will be in breach of the protected right.
You're right - copyright, like all IP law, is highly complex - leave it to the experts...