An MMO (Massive Multiplayer Online) is a form of a game where access to play is typically sold as a monthly subscription to its players, there are typically game items that are made available to users during gameplay, and these items may be added by the game developers over time even if they weren’t available as part of the original game. Subject to the normal restrictions for games, this form of game is allowed under the Royalty Free License.
As an example, Digital Products may be incorporated by the game developer in an MMO, and these items may be sold as playable items in the game for virtual or actual currency, and they may be sold to players, or between players (such as in an exchange). Said another way, you may add a playable hand prop built from a Digital Product and sell it to a player of the MMO as an alternative to achieving the hand prop in gameplay, and players can transfer hand props to other players.
You may also use supplemental apps (e.g., mobile or desktop apps) to allow players to buy, transfer, and trade such items in the game. Moving or editing the rights (also known as “entitlements”) within the game is perfectly fine. The restrictions for MadhuRebba in this regard are around the 3D Models and securing the actual MadhuRebba Products so that your MMO or game will not be a conduit for stealing MadhuRebba Digital Products.