Macro sharing and ownership

Hi everyone,

I was wondering, if I create a macro and share it / export it, will the people a share it to be able to :
-Modify it ?
- Share it ?
- See every step of the macro ? 'and thus, how it has been made)

I would like to be able to share a macro to some people but not letting them modify or share it... It would be even better if it was possible to let them execute the macro on their computer but no letting them see the detail of the macro, but I don't know if any of this is possible...

Thanks in advance for your help