I'm creating a web form out of Excel that a user will input info into cells, push "Submit" and it creates a program. When "Submit" is pushed I want the worksheet, or even just certain cells, locked so he cannot create a 2nd program based on different info.

I think a Macro is the way to do it, but I'm lost as to how. To make things even better it would be awesome if the lock could automatically come off ( unprotect ) after a certain amount of time ( say 60 days )

Am I in "La-La" Land or is this possible?