The presentation will provide an overview of the copyright issues related with the implementation of Open Access policies. It will focus on the need to obtain permission to reproduce and disseminate a copy of any published paper taking into account any copyright transfer signed by authors. This permission is needed to implement Green Open Access policies through repositories. Moreover it will explore the use of open content licenses in repositories and journals to move to the Gold Open Access model that offers not only free access to full text but full reuse of contributions.