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The CERN Open Data Portal is a repository that enables large scale experimental data releases of curated datasets, accompanying software, supporting documentation and example analyses. The CERN's Open Data portal is developed by the CERN Information Technology group in close collaboration with LHC experiments and many researchers in the High-Energy Physics community. The CERN Open Data portal is the access point to a growing range of research data produced by the experiments at CERN and disseminates the preserved output from various research activities and includes accompanying software and documentation needed to understand and analyse the data. The portal adheres to established global standards in data preservation and Open Science: the products are shared under open licenses; they are issued with a Digital Object Identifier (DOI) to make them citable objects. The CERN Open Data portal hosts more than one petabyte of collision, simulated and derived datasets, accompanied with configuration files, documentation, virtual machines and runnable analysis examples that were released into the public domain by the LHC experiments.