trademark = a device (as a word) pointing distinctly to the origin or ownership of merchandise to which it is applied and legally reserved to the exclusive use of the owner as maker or seller.
copyright = the exclusive legal right to reproduce, publish, and sell the matter and form of a literary, musical, or artistic work.
A lot of people mix up trademark and copyright, just as they mix up slander and libel.
Since I used the word "copyright" in my post, I am at fault for not elaborating. Many businessman today try to cash in by putting a "nostalgia" brand on the market. To promote this product, lets say Rheingold beer, they create a web site with old radio commercial sound files, archived newspaper ads, etc. These are protected by copyright, and are designed to promote the sale of the revived brand. Now I have no problem with anyone trying to do this if they have the money, product documentation, and possibly people who produced the old product. My experience is that very few of these people get the revived product right. They might as well call the product by the name of the businessmen who brought this product to market.
Why do junk food chains bring out promo items or "limited time" items? To give their sales figures a boost. They might slather on barbeque sauce or jalapeno-flavored salad dressing. At least these are original, if terrible. But, people will buy them for a "change" or just to try them. Fair game. But in the case of Hardees, the sixth and seventh photos of Mr. King’s update post indicate that the product that Hardees is selling today is not even the one they were selling in 2001.
One of the great aspects of this forum is to keep us from wasting money.