Google docs will only be available to people logged in to the google account(s) you choose to share it with.
ETA: to double check that, click "Share" then choose "See who has access". If it doesn't say "Sign-in is required to view this item", click "Change" and then select "always require sign-in"
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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