1) You can use VBA to hide your sheets, being sure to employ the VeryHidden option, meaning the sheets cannot be unhidden by hand, but only via VBA.
2) You can protect your VBAproject with a password so no one can even see the names of the hidden sheets nor the code you have hidden in there for hiding/unhiding the code.
3) You will also need code to disable the SAVE AS function. In the ThisWorkbook module:
4) Final caveat: as with all "locks", they only keep honest people honest. Any dishonest person with even a little bit of desire will be able to crack into your workbook any number of ways. Excel, like a padlock, is only mildly secure.
Apologies, I just noticed this is an "Other platforms" forum question. Let me know if you want this answer deleted.
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