Ability to Password Protect Document

I would like the ability to password protect an entire Coda document - that would require the password upon opening the document.

For example, I’d like to keep a budget in Coda but I don’t like the fact that it can be opened without any protection other than Google. Most of the time, I remained logged into Google and so if a family member or a friend were using my computer and happened to go to Google Drive, my financial information would be available to be looked at.

I look at it as akin to having Quicken on my computer. I can let people use my computer but if they were to try to open quicken, it requires a password to open up the file.

Thoughts? Workarounds?