Landsat General

The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey.
Landsat satellites have the optimal ground resolution and spectral bands to efficiently track land use and to document land change due to climate change, urbanization, drought, wildfire, biomass changes (carbon assessments), and a host of oth
There are no restrictions on Landsat data downloaded from USGS EROS;  it can be used or redistributed as desired.
Landsat scenes directly downlinked to the EROS Landsat Ground Station become available through EarthExplorer or GloVis within 24 hours after acquisition.