A possible conflict is brought up among the right of cancellation of the particulars and that established to the legislation of archives and public documents. The law of cancellation in treatments that carry out the public administrations is left limited by the duty of conservation. It is necessary to be priced, at each case, if this law can be attended to or to consider the presence of a relevant interest in giving fulfillment to the cancellation of data. The Catalan legislation foresees the procedures of information selection, also of personal character, for its conservation.