prevent users from seeing macro code

I have a macro that I would like to allow users to run but I don't want them to be able to access or see the code. I just want something like a command button that they can click but not be able to see the code behind it.  Of course though, I would need to be able to see it and access it for modifications.  Any way to hide macros and only allow access to them by entering a password or something along those lines?  Thanks.
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Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
One way is to insert a Shape of Form Control Commandbutton to the sheet and assign your code to that shape or commandbutton by right clicking on it --> Assign Macros.

Now on VBA Editor --> Tools --> VBA Project Properties --> Protection Tab --> Check the box for Lock project for viewing and set the password as per your choice --> OK.

This way if a user wants to see the VBA code, user will be required to provide the password to see the code or to modify it.

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Martin LissOlder than dirtCommented:
Be aware however that a determined can find ways to break the protection.
ProfessorJimJamMicrosoft Excel ExpertCommented:
I have seen many protection softwares but many of them are penetrable, what i have found unbeatable so far is the   Unviewable ++ so far i have not seen a software than can break into unviewable protection.
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