What can or can't be printed on merchandise???

How do I find out if certain things can or can't be printed on merchandise?
I don't mean the obvious copyright/trademark protected items but things like catch phrases, lines from songs or films etc

I know that Little Britain lawyers chase up anyone selling t shirts with any of their catchphrases but not sure about others.

There seems to be a grey area when things aren't trademarked or copywritten but fall under 'intellectual rights'.

It is confusing :?

ANy advice or a point in the right direction would be appreciated!
 

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