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?

<P0-S0>  "Freemium" is a portmanteau of "free" and "premium". <P0-S1>  The business model has been in use by software industry since the 1980s as a licensing scheme. <P0-S2> 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. <P0-S3>  A subset of this model used by the video gaming industry is called free-to-play. <SEP> <P1-S0> 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. <P1-S1>  Until version 2.2, WURFL was released under an "open source / public domain" license. <P1-S2>  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. <P1-S3>  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. <P1-S4>  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. <P1-S5>  The current version of the WURFL database itself is no longer open source. <SEP> <P2-S0> <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. <P2-S1>  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. <P2-S2>  Open-source licensed software is mostly available free of charge, though this does not necessarily have to be the case. <P2-S3>  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. <P2-S4>  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). <P2-S5>  One popular set of open-source software licenses are those approved by the Open Source Initiative (OSI) based on their Open Source Definition (OSD). <P2-S6> </onlyinclude> <SEP> <P3-S0> Tales of Maj'Eyal is an open source roguelike video game released 2012 for Microsoft Windows, Mac OS X, and Linux. <P3-S1>  "Tales of Maj'Eyal" is available as donation-supported Freeware/Donationware from the developers. <P3-S2>  Donations grant some exclusive online features (Freemium model). <P3-S3>  The game may also be purchased through the digital distribution outlets Steam or GOG. <P3-S4>  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."