Information and data are entirely about the intent of them. The same number can mean a movie file or a math equation in different interpretations, yet still have the same physical representation.

The difference between passwords, DRM, and proprietary software is then intent. They all serve the same function - secrecy - but for different purposes. The secret password is meant to provide security to the holder in regards to the information they hold. Proprietary software and DRM are meant to provide secrecy to the rights holder in regards to software other people hold.