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You can password protect your google drive files and folder by using Lock it up google chrome extension. Lock it up is a free google chrome extension that password-protect files or folders.
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you can also disable the download, print, and copy of the file. it will prevent changing access and also from sharing with new people. To protect the files and folders checked the owner settings as your requirement.
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How to protect your Google drive folder?.Why you need to password protect your Google drive folder?.
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