Google Drive can be used to store your notebook profile information. This might be used when combined with the previous emailing of a notebook to another user. The recipient could use a Google Drive profile that would preclude anyone without the profile information from interacting with the notebook.

You install the python extension (from https://github.com/jupyter/jupyter-drive) using pip and then python -m. From then on, you access the notebooks with the Google Drive profiles, as ipython notebook -profile <profilename>.