Hapara continue to update and improve their new Workspace assessment management tool in TD.
Now, when students submit work via Workspace any documents submitted are automatically "embargoed". Here, the student's permissions change from 'edit' mode to 'suggest' mode (see here) while the teacher assesses the work. Full student editing rights are restored when the teacher returns the doc to the student.
We encourage you to try this new feature and provide any feedback directly to Hapara using the "How can we improve this page" feedback box at the bottom of every TD screen.