Due to the non-exclusivity that allows to sell as many licenses to the same photo as buyers are willing to buy, images sold under RF license are widely distributed across stock photo agencies, and priced at low (and flat) rates. For this reason they are also often in use by different people, companies and brands at the same time, in different ways.
Rights Managed license provides time and geographically limited, specific and per-use rights to use an image, and often times also grants exclusive usage during the licensed period. The license only covers the consigned use, so to use the image in any different way, a new license is needed. This license includes digital rights management and basic rights management.
The price for the license depends on the specifics of intended use, sometimes it turns out affordable, and others it can get considerably expensive. Due to the more detailed buying process, and the custom-set, specific rights a buyer acquires over an RM image, these tend to be less widely available, and for the same reason they don’t have so many duplicates in use simultaneously.