Murky,
Everything in the Piranha kit will be copyrighted.
It's just that policing the abuse of copyright is very difficult. It's probably not cost effective for Robert Saunders to chase everyone who uses them without permission. It would be better to pick on one person, hammer them with legal procedures and then publicise the action as a deterent.
The thing is that you cannot copyright an idea. I think they settled on pink because it gave the best response in split tests. If you want to print your own ads on pink paper that's fine. If it's a word for word rip off, that's something else.
I've had a similar thing happen with a copywriting project in another industry. There has probably been over a hundred hours of work gone into this. The site is doing well. So well, that two competitors have, to all intents and purposes ripped it off.
They've changed the look of their sites to very close to "ours". They have mimicked the style of the copy and even a lot of the words. To paraphrase the late, great Eric Morecambe, they've "used the same words but not necessarily in the same order".
This will not show up at copyscape.com because they are not exact phrase copies. It's frustrating but there is not a lot we can do.
As I said before, it's OK to model an ad but not copy it.
Garry