SPSS 21 and later can package multiple kinds of files inside an encrypted wrapper. The wrapper has a common format, regardless of the kind of the file that it contains.
Warning: The SPSS encryption wrapper is poorly designed. It is much cheaper and faster to decrypt a file encrypted this way than if a well designed alternative were used. If you must use this format, use a 10-byte randomly generated password.
|• Common Wrapper Format:|
|• Password Encoding:|