I remember my first day at "knife school". A friend offered to teach me how to make knives and I readily accepted his offer. The one thing he did that I now think was a really smart move on his part was before anything else he made me sit down and draw out a knife that I could make (with his help). For at least two hours I drew and redrew my knife only to have it come out very similar each time to a knife he made that I really liked. He kept telling me it looks too much like his knife and each time I kept creeping back to that design. Finally he grabbed his knife blank to point out the similarities to me. Then he sketched the basic lines of what he thought would be an easy first knife and from that I created a design. It was butt ugly (not in my mind then though) but it worked for a first knife and it didn't look like anything he was doing or would do.
After completing that knife and starting up my own shop it took me about a year to get a design which had no influence of that original design that I did on my first day. Each time I tried to make a knife there was always some element of my original design. This was something I wasn't seeing at the time, rather I saw it after I had broken this cycle.
I can't say for sure why I kept doing that but I think it was lack of confidence in myself. The irony there is that it was only through designing truly different knives did the confidence grow.
So what the hell am I saying????
Oh ya! Speaking for myself if my friend had let me use one of his designs to start I would have been stuck making similar knives to his for quite some time, maybe longer than I was stuck with my original design. I was forced to start (thankfully) at a point all on my own. In this way I wasn't copying anyone but myself.
Now I'm absolutely not saying that it's the teachers fault here if a design is copied! That's totally not what I am trying to get at. I think that in some cases the new knife maker has a hard time breaking away from what they started with. If they start with a design from their teacher then it may be difficult to find something they can truly call their own at least for a little while.
Of course all of what I said can only be applied to a new knife maker that is seeking to carve out his/her own place in the knife making world. If they are happy with not growing as a knife maker or are less than ethical then a cycle of design copying and frustration for others may very well be easy for them to fall into.
Anyhow I'm not defending design theft in any way, I think it is wrong. I am merely pointing out that for a new knife maker influence can occur without them even knowing it until much later.