Thanks for the replies so far. I'll freely admit this area has never made much sense to me, particularly with the KO issue. So let me give a specific now.
I search in the museum for 2x2x5. It comes up with Jesse Werner as the inventor. So I look in the member list and see that Jesse hasn't been in the forums since early 2011. He does have a youtube vid of his 2x2x5. And so do a number of other people who have each apparently made one themselves as well. So can a cuboid ever be "knocked off"? (I remember a thread a week or two back where Tony commented that he would never consider anyone to be able to own the rights to a cuboid, or something like that) Does Jesse own rights to the 2x2x5? If I ask someone else to make me one, am I or that person doing the wrong thing?
I see names such as TomZ, Greg and Tony F (and I'm sure I just offended some people whose name I didn't say) mentioned a lot on here as puzzle designers/builders. Does it mean that theoretically if I wanted something made I could just ask one or more of them to do it?
Another case in point:
I would start at the Museum. For example, search for 3x3x7 and look at this one. This was made by Traiphum, who you can contact on this forum, and ask him to make one for you.
let's say Traiphum is happy to make me one, can I buy it from someone else who also happens to be able to make it? (Not that I'm suggesting I wouldn't want to buy it from Traiphum...)
Next case in point: The museum, under a search for 4x5x6, comes back with:
After the creator has designed a 1x2x3 and a 3x4x5 this puzzle was "just" the next logical step although it needed a request of Sigurd Wedel before it could come to life.
So Tom made it, but only at Sigurd's request. Who owns rights to it? Does this mean Sigurd owns the first one made, and then Tom made it available on SW for anyone to buy?
Last case: I search for 6x6x3 in the museum. no results. So I assume this means no-one has ever made one, at least that the TP forums know about?
hoping some of this
can be cleared up.