Censorship and corporate logos…

I’m not a huge wrestling fan these days – however, back in the day I used to watch it quite a bit. Ended up seeing some older wrestling stuff last night and realised that the old WWF symbol had been blurred out of sight. I knew that the ‘real’ WWF – the world wildlife fund, had managed to get the now ‘WWE’ to stop using the WWF name, but I didn’t realise that this extended back into the past. Does anyone know of similar happenings? Is this normal is copyright disputes?