The invention relates to a self-adhesive or heat-sealable security information medium designed to be applied to a page of a security document and to receive printing and/or writing, comprising an adhesive layer and at least one covering layer that covers the adhesive layer, characterized in that the cohesive strength of the covering layer is less than the adhesive strength of the adhesive layer.The invention also relates to a method for the security protection of a page of a security document and to a security protection feature used in the security protection method.The invention also relates to a page of a security document possessing said security protection feature and to a passport possessing said page.