Question: What type of license is the open source roguelike video game video released 2012, in which a subset of it's pricing model is a called free-to-play, licensed under?

Passages:
Cataclysm: Dark Days Ahead, or "CDDA", is an open source survival horror roguelike video game.  "Cataclysm: Dark Days Ahead" is a fork of the original game "Cataclysm".  CDDA features text based graphics but has an alternative graphical tiles version. <onlyinclude>An open-source license is a type of license for computer software and other products that allows the source code, blueprint or design to be used, modified and/or shared under defined terms and conditions.  This allows end users and commercial companies to review and modify the source code, blueprint or design for their own customization, curiosity or troubleshooting needs.  Open-source licensed software is mostly available free of charge, though this does not necessarily have to be the case.  Licenses which only permit non-commercial redistribution or modification of the source code for personal use only are generally not considered as open-source licenses.  However, open-source licenses may have some restrictions, particularly regarding the expression of respect to the origin of software, such as a requirement to preserve the name of the authors and a copyright statement within the code, or a requirement to redistribute the licensed software only under the same license (as in a copyleft license).  One popular set of open-source software licenses are those approved by the Open Source Initiative (OSI) based on their Open Source Definition (OSD). </onlyinclude> The Binding of Isaac is an indie roguelike video game designed by Edmund McMillen and Florian Himsl, initially released in 2011 for Microsoft Windows; the game was later ported for OS X, and Linux operating systems.  The game's title and plot are inspired by the Biblical story of the Binding of Isaac: after Isaac's mother receives a message from God demanding the life of her son as proof of her faith, Isaac flees into the monster-filled basement of their home, where he must fight to survive.  Players control Isaac or one of six other unlockable characters through a procedurally generated dungeon in a roguelike manner, fashioned after those of "The Legend of Zelda", defeating monsters in real-time combat while collecting items and power-ups to defeat bosses and eventually Isaac's mother. Freemium is a pricing strategy by which a product or service (typically a digital offering or application such as software, media, games or web services) is provided free of charge, but money (premium) is charged for additional features, services, or virtual goods.  "Freemium" is a portmanteau of "free" and "premium".  The business model has been in use by software industry since the 1980s as a licensing scheme.  A subset of this model used by the video gaming industry is called free-to-play. The BitTorrent Open Source Licence, is derived from the Jabber Open Source License, which is an Open Source Initiative (OSI) approved license.  Former versions of the BitTorrent client (before 6.0) and related pieces of software are licensed under this License which is available here: https://web.archive.org/web/20110809153637/http://www2.bittorrent.com/legal/bittorrent-open-source-license Tales of Maj'Eyal is an open source roguelike video game released 2012 for Microsoft Windows, Mac OS X, and Linux.  "Tales of Maj'Eyal" is available as donation-supported Freeware/Donationware from the developers.  Donations grant some exclusive online features (Freemium model).  The game may also be purchased through the digital distribution outlets Steam or GOG.  The game's TE4 game engine source code is under a GNU GPLv3 license, the game's assets are licensed for use "with the Tales of Maj'Eyal game only." DRL (formerly DoomRL), short for Doom, the Roguelike, roguelike video game developed by ChaosForge.  Since 2002 in-development and based on the first-person shooters "Doom" and "Doom II", it was released for Microsoft Windows, Linux and OS X.  Following a cease and desist notice from "Doom" trademark owner, ZeniMax Media, the game's names was changed to "DRL" in 2016. Common Development and Distribution License (CDDL) is a free and open-source software license, produced by Sun Microsystems, based on the Mozilla Public License (MPL).  Files licensed under the CDDL can be combined with files licensed under other licenses, whether open source or proprietary.  In 2005 the Open Source Initiative approved the license.  The Free Software Foundation (FSF) considers it a free software license, but one which is incompatible with the GNU General Public License (GPL).  In 2017, according to Black Duck Software the CDDL is the 16th most popular FOSS license (with less than 1% use), after the AGPLv3. WURFL (Wireless Universal Resource FiLe) is a set of proprietary application programming interfaces (APIs) and an XML configuration file which contains information about device capabilities and features for a variety of mobile devices, focused on mobile device detection.  Until version 2.2, WURFL was released under an "open source / public domain" license.  Prior to version 2.2, device information was contributed by developers around the world and the WURFL was updated frequently, reflecting new wireless devices coming on the market.  In June 2011, the founder of the WURFL project, Luca Passani, and Steve Kamerman, the author of Tera-WURFL, a popular PHP WURFL API, formed ScientiaMobile, Inc to provide commercial mobile device detection support and services using WURFL.  As of August 30, 2011, the ScientiaMobile WURFL APIs are licensed under a dual-license model, using the AGPL license for non-commercial use and a proprietary commercial license.  The current version of the WURFL database itself is no longer open source. Dungeon Crawl Stone Soup is a free and open source roguelike computer game, which is the actively community-developed successor of the 1997 roguelike game "Linley's Dungeon Crawl", originally programmed by Linley Henzell.

Supporting sentences:
 The game's TE4 game engine source code is under a GNU GPLv3 license, the game's assets are licensed for use "with the Tales of Maj'Eyal game only." Freemium is a pricing strategy by which a product or service (typically a digital offering or application such as software, media, games or web services) is provided free of charge, but money (premium) is charged for additional features, services, or virtual goods.  A subset of this model used by the video gaming industry is called free-to-play.