Carpet Dawg,
In answer to you question, I looked into copyright law a few years ago when we had a sign business. We were employing graduate graphic designers that were coming up with very good designs for signs and vans etc that sometimes we would not get the job, but a few weeks later we would see something with our design on erected by people who did not have the ability to create.
Basically any thing that you produce and submit to anybody needs to have the c circle copyright logo on it with a date. Anybody who produces anything the same would need to prove that is was produced before yours.
It is not that complicated and once I had clarified this we did stop some people using our designs. It works both ways though we did have some Chinese takeaway give us a drawing of something they wanted as a sign. They ripped this off some multinational. Because we had scanned the original drawing given to us, no action was taken against us but the takeaway had the cost of rebranding.
Most legitimate firms will not break copyright laws. At the end of the day you only have to make subtle changes to something to make it unique to you.
Peter
www.carpetcleanercardiff.comhttp://