From 1968 to 1970, what are indicator names whose license type is open and values are less than 100?
From 1968 to 1970 refers to Year between '1968' and '1970'; values are less than 100 imply Value<100;
SELECT DISTINCT T1.IndicatorName FROM Indicators AS T1 INNER JOIN Series AS T2 ON T1.IndicatorName = T2.IndicatorName WHERE T1.Year >= 1968 AND T1.Year < 1971 AND T2.LicenseType = 'Open' AND T1.Value < 100