Andy,

I do know the Illustrator, work with it every day so I can totally appreciate the effort you put in to this. I have also dealt with evil Empire that is the Bay and PP (one and the same)
If you produced the drawings, regardless of what they are, they are yours, no one can copy or sell them. Perhaps it's not as easy to deal with eB being based in UK but here you can get through to them on the phone (email is easier) and actually get them to drop the auctions, I have seen it done, in some cases based on false allegations... Not with me, got friends who have built a million dollar business with them. I don't have much to do with it, might buy one item in a year, but in last few days I was able to source few small parts for my 1970 Yamaha 125, discontinued parts that I gave up looking for through my regular sources. Those were either NOS parts from an old dealer or quality repros, problem is that I had to sift through 10,000 listings...