To anonymize or to dissociate the information it is necessary to eliminate those data that allow to identify the person affected, direct or indirectly, in reasonable thermal baths, that is, without disproportionate efforts. At the same time, the dissociation should not eliminate elements or information that they make impossible the understanding of the information of whole. This double condition will entail that the Town Council has to make an appraisal or ponderation with respect to which system of dissociation it can be more effective in each case, in the terms that participate in this judgement.