[segfaultbuserr]

Note that it cannot, theoretically, completely stop someone from producing a device with an identical layout. Since only the expression is protected, not the idea or system, theoretically, if your layout is the only reasonable layout to implement the circuit in question, it's legal for someone else to ignore your layout's copyright status and produce an identical copy of it.

For example, some special RF and analog devices require special layout techniques to ensure their proper operations. It must have a copper pour at this location, and it must have a guard ring at that location, etc., to achieve its tested performance. If you are able to argue the layout in question is the only reasonable layout to implement the circuit, the layout is not copyrightable in general. And in RF planar circuit it's even weirder - the layout itself is the circuit [0]. If the layout in question is the only reasonable implementation of the circuit (you cannot make a hairpin filter with an identical frequency response unless it looks like the original hairpin filter), it's not copyrightable.

While it's not legal to copy the entire board, copy a small subsection is possible.

[0] https://en.wikipedia.org/wiki/Planar_transmission_line