A cornerstone of good scientific practice is to make results available to the public. This is especially
true for experiments at the LHC at CERN where public investment in fundamental research
is significant and long-standing. As part of their commitment to open access and public engagement
the ATLAS and CMS collaborations have made several large datasets available to the public.
There are many challenges posed in presenting complex and high-level data to the public in an
accessible and meaningful way. We describe the solutions to these challenges, part of which is
the creation and use of the CERN Open Data Portal and the content found therein. Furthermore
we describe the impact and future plans of the ATLAS and CMS open access efforts including
future releases of data and accompanying educational material.