Key _Live Data in refers to live data associated with the ticker provided in Ticker retrieved from Yahoo.
By design these data are refreshed (downloaded from Yahoo) every time the user requests that they are displayed.
Typically they are not truly "live" since they are furnished by Yahoo with some delay of about 15 minutes on average.
The exact delay depends on the exchange producing the data. Visit here for a table of delay times per excchange.
Note this key is prefixed by _, which indicates it is regarded as a read-only part of the object's data and therefore its associated value cannot be edited.
For that reason it does not appear as part of the input data.
It carries informational only value for the user and appears as part of its contents.
Also it completely depends on the remaining object contents and therefore is never part of the exported object's data.