Even the UK probably differs between England and Scotland, and the EU is 27 further jurisdictions. It's different everywhere.
But common sense applies everywhere; if you don't understand it don't sign it, if you don't want to be held by it then don't sign it, if you promise never to enforce it then just take it out of the contract.
But common sense applies everywhere; if you don't understand it don't sign it, if you don't want to be held by it then don't sign it, if you promise never to enforce it then just take it out of the contract.