OER may be freely reused, revised, remixed, retained, and redistributed. Unless the open license includes a NonCommercial stipulation (e.g., CC-BY-NC), users are free to use OER for any purpose, including commercial purposes.
Creative Commons’ NonCommercial (NC) licenses prohibit uses that are “primarily intended for or directed toward commercial advantage or monetary compensation.” This is intended to capture the intention of the NC-using community without placing detailed restrictions that are either too broad or too narrow. Please note that CC’s definition does not turn on the type of user: if you are a nonprofit or charitable organization, your use of an NC-licensed work could still run afoul of the NC restriction, and if you are a for-profit entity, your use of an NC-licensed work does not necessarily mean you have violated the term. Whether a use is commercial will depend on the specifics of the situation and the intentions of the user. CC has a brief guide to interpretation of the NC license that goes into more detail about the meaning of the NC license and some key points to pay attention to (Source).
Commercialize, open content, OER, NonCommercial
Butcher, N. (2015). A basic guide to open educational resources (OER). Commonwealth of Learning, Vancouver and UNESCO. Retrieved from http://oasis.col.org/handle/11599/36