Thanks for clarifying @moworks! :) My concern is not about copying images from the website or whitepaper though. That is not what I said.
If someone uses our own edits or modification of the whitepaper/website images that's fine too? We can copy each other's edited images? As an artist that's a concern if for example on a different image, we worked on editing items from the website or whitepaper only for someone to copy the edited layout. That was what I informed him because that is what I understood is not allowed in the written rules above.
Because if that is allowed then I will not submit my entries earlier if someone will just copy what I edited. Kindly expound that part of the rules about copying. Kindly clarify the rules further @moworks for future contests as well. Thanks.