CC-BY (Creative Commons Attribution License)
The article you clicked on was published using a CC-BY license, which means the following.
You are free to:
Share- copy and redistribute the material in any medium or format
Adapt- remix, transform, and build upon the material for any purpose, even commercially.
The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
Attribution - You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
No additional restrictions - You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
The wording on this page was taken from the Creative Commons website.
Updated 23 July 2014