I really like your example of using the z-library as part of your discussion. The four different aspects you mentioned in yout post show clearly what an OER should have. If a resource cannot be open accessible, unable to customize and no license or copyright, it should not be called an OER. Even if the z-library do enhance students’ leanring and meets the sharing purpose of OER, due its complexity of modifiing, and its hard access prerequisites, it still cannot be an OER. I strongly agree with your idea discussing that the global trend of OER is to add more native language resources for different countries, as using the native language for the study usually can increase students’ learning efficiency by a huge scale.