prevent copy sheet within a workbook for a specific worksheet (deactivate RIGHT CLICK?)

You can block delete, copy, move of specific worksheet using VBA worksheet change event, however, the problem with macro based solution is, that If user does not enable macro, the protection is not enabled, and if workbook is opened with macros being disabled then worksheet isn't protected.

Lets assume you are protecting a specific worksheet called "Form"  (as per your earlier examples)  then placing this code into the worksheet will do the job.

If you download the attached workbook and enable macro. you cannot delete, move, copy the Form worksheet, while you can delete,move or copy other worksheets.

Private Sub Worksheet_Activate()
ThisWorkbook.Protect "Hello"
End Sub
 
Private Sub Worksheet_Deactivate()
ThisWorkbook.Unprotect "Hello"
End Sub