Providing links to creators in 'fan fic' RPs?

I received a message saying that I must 'provide a link to the company/official website to the creator of the series' on my Harry Potter Roleplay. I have linked Warner Brothers Entertainment, Bloomsbury Publishing and JK Rowling - is this alright?

Here's the rp...roleplay/hogwarts-class-of-1942/

Source: http://feedproxy.google.com/~r/RolePlayGateway/~3/APSkgmmbPY8/viewtopic.php

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