NotebookLM is designed to feel like a private “AI research assistant” that only reads the contents of what you upload. That’s mostly true, but “private” isn’t the same as “confidential.” The gap matters if you’re thinking about uploading personal identifiers, customer files, or regulated documents. This guide breaks down Google’s stated policies in plain language, then turns that into a practical “safe to upload vs don’t upload” framework. Private vs confidential: the mental model that prevents mistakes Here’s the safest way to think about NotebookLM: Private means your sources (and their contents) aren’t publicly visible by default, and Google says they aren’t used to directly train its foundational models unless you provide feedback. ( support.google.com ) Confidential means you can upload it without worrying about human review, accidental sharing, retention windows, cross-service handling, or policy edge cases. NotebookLM can be private and still be a bad place for confidential ...
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