Previously if you said absolutely nothing to the police after being given a Miranda warning it would NOT constitute a waiver of your rights, meaning you had not given up the right to be silent. Under the new ruling it means silence can be taken as you giving up your right until you "unequivocally" establish that, and it becomes more difficult than it was previously to establish those rights. If you want to see why it is not right to have an unequivocal requirement see my point above.