Open data is data that is openly accessible, exploitable, editable and shared by anyone for any purpose. Open data is licensed under an open license.
Clear labelling of the licensing terms is a key component of open data, and icons like the one pictured here are being used for that purpose.
The State of Open Data, a 2019 book from African Minds
Free content, libre content, libre information, or free information is any kind of functional work, work of art, or other creative content that meets the definition of a free cultural work, meaning "works or expressions which can be freely studied, applied, copied and/or modified, by anyone, for any purpose." Free content encompasses all works in the public domain and also those copyrighted works whose licenses honor and uphold the definition of free cultural work.
The logo on the screen in the subject's left hand is a Creative Commons license, while the paper in his right hand explains, in Khmer, that the image is open content