As of ESO Observing Period 91, the ESO Science Archive Facility (SAF) is the sole access point for data obtained with ESO telescopes. This includes access to proprietary data for both Visitor and Service Mode runs.
[Archive]: New Implementation of the ESO Data Access Policy
Typically files become available from the SAF within a few hours of the time of observation. As of 1 April 2013, the proprietary period for all science and acquisition files will run from the moment the file can be accessed and downloaded from the SAF. This means that the "proprietary period" will begin on that date. No PI or PI delegate action will affect the proprietary period. This new implementation applies to all observations belonging to Observing Period 91 and onwards, as well as data from earlier Observing Periods which were carried over to Period 91.