Open Data, Open Source, Open Standards
In the era where opennes has become highly valued we sometimes observe confusion about the meaning and consequence of an "open X". We, therefore, briefly discuss three core terms heavily debated in the science data domain.
This addresses accessibility of data. Data are said to be open if they can be accessed without any restriction stemming from constrained user groups, etc. A related term is "Free Data" meaning that access is free of cost.