What is meant by “Subcontractor” from the point of view of checking the reliability and checking the health of the engine (reliability monitoring & engine health monitoring)?

As provided in point CAMO.A.125(d)(3), a CAMO may organise the performance of limited continuing airworthiness tasks with any subcontracted undertaking, working under its Management System, which shall be included in its certificate of approval (AC-CAMO-P01-F14).
Tasks that can be outsourced include reliability control and engine health control (reliability monitoring & engine health monitoring). 
However, when these tasks are entrusted to the manufacturers or owners of the aircraft or engine designs and their feedback is limited to reporting to CAMO the reading of the data provided, it will be considered as non-subcontracting and, therefore, will not be included in the CAMO approval certificate.