There are different types of licenses when it comes to availability of data. There is open access and creative commons licenses. An open access license allows articles published under the license to be made freely available online as soon it published, without any payment walls. An example of this would BioMed Central, as it provides articles without any barriers of payment. Metadata can be defined as data that provides additional information about other data, but not the actual information the article is talking about. An example of this can the authors name, the size of the article file, or even the data the article was created. While a creative commons license allows free distribution of property that would be copy righted if it was not under the license. An example of this would be the book Little Brother, as it is distributed under the creative commons license. An article that I found which is open access is Terrestrial vegetation redistribution and carbon balance under climate change. In this paper, the authors study two different scenarios which consist of moderate and strong climate change to get a better look at the spatial redistribution of major vegetation types along with their carbon balance in 2100. If you are further interested in the article, I strongly recommend checking the link below!
References
https://cbmjournal.biomedcentral.com/articles/10.1186/1750-0680-1-6
Applied Plant Ecology Winter 2020 