Open Education Resources Repositories (OER) are a lifelong learning strategy for professionals within LatAm, although each country presents its own challenges and priorities. We aim to address sustainability of an open education initiative through the study of the influence of the region's public policies that foster/guide the development of OER Repositories. The presentation will showcase the case study of Mercosur’s OER repositories present in the PAHO's OER Network and present the research results to understand the impact of public policies on OER-based Digital Repositories.