Ortofoto České republiky (opens in a new tab)
Český úřad zeměměřický a katastrální (ČÚZK)
Cost Free Licence Open- Orthophoto
National open imagery Openly licensed aerial orthophotography at 1 m or finer covers about 70% or more of the land area.
ČÚZK's Ortofoto České republiky covers the whole country at a 12.5 cm pixel size in R, G, B and NIR, free of charge under CC BY 4.0.
Free is not the same as open. Cost is what you pay to get the data; the licence says what you may do with it. How cost and licence are defined
Český úřad zeměměřický a katastrální (ČÚZK)
Cost Free Licence Open