Thanks! We're working on a feature that will let you share a book “metadata-readonly”: allow editing of rows/cells but not the structure of the book (sheets, fields, links, formulas, etc.)

Longer-term we might offer more fine-grained locking or permissions control.

Unfortunately we don't yet have that particular feature... But we definitely want to do something like that in the future. What are you thinking you'd use it for (we love to collect information like that for when we do implement the feature).

Obviously, using the API you could build a restricted interface on top of fieldbook, but that probably isn't what your looking for, I understand :).

We're also considering doing a mode where you can't change any of the metadata (sheets/fields) but can add/remove/change rows.