Lever Talent Intelligence (LTI) protects users' workbooks by assuring that only you are able to make changes to your own workbooks from Tableau Server's Web View.
When editing a workbook, you can only save or override the existing workbook if you created that workbook. If you edit someone else's workbook, Tableau will prompt you to save a new copy of the workbook.
For more info on creating content on LTI please refer to How do I create new worksheets?.