Aerio does not allow restrictions to be placed on free ebook giveaways.
Once you've enabled your ebook as a Free Giveaway, anyone will be able to download it and read it. The viewer will own the ebook indefinitely, there are no expiration dates.
In order to stop your ebook from being available as a free giveaway, you'll need to manually turn off this setting in your Book Dashboard. For instructions on how to do this, visit: How to Set-Up an Existing eBook as a Free Giveaway
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