En[crypt {SQL | FILE | DTS};Path;ProtectionLevel[;password Operation. Encrypts the loaded package with the specified protection ...

En[crypt] {SQL | FILE | DTS};Path;ProtectionLevel[;password]

Operation. Encrypts the loaded package with the specified protection level and
password and save it to the specified location.  The level determines whether
the password is needed or not.

o SQL  - Path is the path and name of the destination package.
o File - Path is the fully qualified path and file name for the package.
o DTS  - Path is the path and name of the destination package.

Protection  
  Level     Description
    0       Strip sensitive information.
    1       Sensitive information is encrypted using local user credentials.
    2       Sensitive information is encrypted using the required password.
    3       Package is encrypted using the required password.
    4       Package is encrypted using local user credentials.
    5       Package uses SQLServer storage encryption.