If you are in the U.S. you might have seen this product shown below in the center with the graphic white label sporting red tomatoes and green and white lettering. It says right there, “San Marzano” tomatoes. They are not a true San Marzano product. They contain calcium chloride. They come in crushed, diced, puréed etc.    The brand is simply named after the famed tomatoes, which is legal to do in the U.S. They don’t even try to fake a DOP label; using the name is enough to confuse shoppers. Some folks love them. That’s fine, just know what you are buying.