Allow Office Add-in in Excel to make cells read-only for end-user
Our use case requires that our add-in be able to populate a table in the worksheet with values, but some of the values should be read-only for the end-user. (In our COM/VSTO add-in we toggled worksheet protection off/on to accomplish this).
See this forum post for the origin of this suggestion:
Office Extensibility Team
Shaun Logan commented
I should have put this in the Office.js category