Ok, first, copyright laws don't apply here. It is patents you are thinking of and all you have to do is look at the packaging to determine if there is a patent, the patent number will be listed. If a bait is patented, making them for your own use doesn't mean you can't be sent a cease and desist or be taken to court, if the patent holder notices and decides to take action, they can.
Now, there isn't a patent on this bait that I am aware of as Bass Tackle has a whole slew of these molds available and just about everybody and their uncle is making and selling these swimbaits.