Fernando Ariel López writes [es] for Infotecarios about Law 26899: Creating Digital Institutional Repositories of Open, Owned, or Shared Access [es], also known as the Open Access Law, approved in Argentina in November 2013, after a long process initiated in 2009. 

The scientific-technological production resulting from the work, training, and/or projects funded wholly or partially by the public funds from its researchers, technologists, faculty, post-doctoral fellows, and masters and doctoral students should be shared in free and open access.

Open Access logo, obtained from Logo Wikimedia under the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication license.

Later, Fernando quotes Jorge Atrio from the REDES Center:

Some big publishers might perceive the initiative as a threat to their interests, but progress on free access to scientific information should generate a consensus and different types of institutional re-engineering.

Finally he includes an analysis of how true to “open access” the law is: 

According to the analysis [es] and variables that the Board and policy estimators are considering in favor of open access to the MELIBEA scientific production, the Open Access law in Argentina is 84.47% OA.

Other articles by Fernando Ariel López in Infotecarios that make a “brief” introduction to the open access to knowledge movement:
Una guerra de ciencia ¿ficción?: monopolios editoriales vs. acceso abierto [es]
Un Bien Público sin precedente = vieja tradición y nueva tecnología [es]
Verde, que te quiero verde… acceso abierto [es]