Fuente: Wipo "digitalization" Methods, systems, and apparatus, including medium-encoded computer program products for selecting and displaying content in privacy preserving manners are described. A first trusted content platform (CP) that executes within a first trusted environment can receive a digital component (DC) response that can include: (i) data indicating constrained DCs and, for each constrained DC, distribution parameters; and (ii) data indicating at least one contextual DC selected according to contextual data. The first trusted CP can send to a second trusted CP a second DC request that can include set of constraining values and the distribution parameters. The first trusted CP can receive from the second trusted CP, data indicating (i) one or more constrained DCs selected and (ii) selection values generated based on the set of constraining values. The first trusted CP can select a DC based on a selection value for each contextual DC and the selection value.