Google patents secure system for selecting digital content components

1. A computer-implemented method comprising: receiving, by a secure distribution system and from a client device, a digital component request comprising a set of data; in response to receiving the digital component request: identifying, by a customization orchestrator of the secure distribution system, a multi-stage workflow for selecting a digital component from candidate digital components of a given content platform based on the set of data, wherein the multi-stage workflow comprises a sequence of customization modules that are communicatively coupled to one another by a common data bus, each customization module comprising a set of worklets comprising one or more customized worklets provided by the given content platform and one or more standard worklets used in customization modules of multiple content platforms; executing, by the secure distribution system, each customization module of the multi-stage workflow according to the sequence of customization modules of the multi-stage workflow to select the digital component, the executing comprising: for each respective customization module of the sequence of customization modules: providing, by the customization orchestrator, a set of input data to the respective customization module over the common data bus; executing each worklet of the respective customization module in a sequence defined by the respective customization module to generate a set of output data; and sending, by the customization orchestrator, the output data to the common data bus, wherein the output data for the respective customization module comprises data indicating a given digital component selected by the respective customization module based on the set of input data provided to the respective customization module; and causing the client device to present the given digital component.