When encrypting a file, only the last version of this files will be encrypted. All other versions will be deleted.
How to encrypt a file:
Warning: When encrypting a file, all versions of this file will be deleted, except for the current version. If you need to keep an older version, save it before encrypting the file.
In the Drive app, click on a file in the detail view. In the pop-up, click the icon . Click on in the menu.
You can also select a file. Click the in the toolbar. Click on in the menu.
If the file contains multiple versions, the Encrypt Files window is displayed. Confirm that you want to encrypt the file and delete all previous versions by clicking on .
If the file contains one version only, the file is encrypted without further request.