And as another Olimex blog post makes clear - you won't get noticed or copied until you are selling thousands.
And if you are noticed, then it doesn't matter what sort of licence you applied - you will be copied if there is profit to be made from the operation.
So why give your designs away in such a fashion? You only antagonise people who want open/free/libre designs, and you stop not one single greedy or selfish person! Go all the way towards freedom, and you will have a bunch of users who will make your stuff better with you, not moan about the license!
Kind regards