How To Protect The Worsksheet Name From Modification

I have an Excel template with 10 Worksheet(tabs). 8 of the sheets have predefined charts built based on the data in first 2 sheets. Through a web application user downloads data on the first 2 sheets. A macro is then executed (at the end of the download) to Update (through Macro) the charts in the remaining sheets and the sheets are password protected. The idea here is that user can generate predefined charts from the downloaded data but cannot modify any information. In addition to that user need an ability to add additional sheets to generate custom reports/charts.

So my requirement is to protect the 10 predefined sheets from modification including the modification of sheet name/deletion of sheet but allow user to add additional sheets. Protecting the workbook does not allow user to add additional sheets. Protecting individual sheets doesn't prevent user from renaming the sheet names.