Sales that generate no revenue may represent the following:
- Failed downloads
- Downloads or streams made during the free trial period of a DMS (Digital Music Service)
- Stream made through a freemium (and/or ad-free) subscription generating very little to no revenue
- Stream made through a special offer with the listener's telephone company
- Sales that generated very little revenue and after the conversion from the store's reporting currency become almost null. In this case the value will not be exactly zero.