How to run encrypted child package from parent package

I am trying to figure out how to run an SSIS package that is encrypted but also has a child package which is encrypted. I am trying to run from the cmd line using dtexec and specifying DECRYPT <pwd> for the parent package but how do you specify for the child package.

Please help if you have seen such an issue before or you have a work around.

Thanks

Newbie

The Execute Package task has a PackagePassword property that you can set at design-time, or by a configuration at run-time.