Forum:Big.. Q

Me and my friends recently play duel card monsters and last time we played was in 2004/2005. Now I'm actually confused with somethings they say, they say if "mystical space typhoon"/"harpy's feather duster"/etc. destroys a closed majic or trap card(s) on the field you can't activate the majic and/or trap(s) on the field anymore, now I say trap/majic card(s) which doesn't require anything can be actived such as "jar of greed", on the other hand I know cards like "mirror force" can't be actived.

Now about the main thing, they claim this rule was in 2004/2005 but I think it was never like that, could you guys please conform what I'm trying to say and please post some evidence along, I'd appreciate any of your help, thanks.