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In some cases, ads may be show to the users.
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Basically, a product is offered Free to Play (Freemium) and the user can decide if he wants to pay the money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game.
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This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use).
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Its main features are its integrated search engine (allows searching for torrent from the main torrent Web sites simultaneously in a transparent fashion), its support for l'UPnP/NAT-PMP, Bittorrent protocol encryption (Azureus-compatible), Peer Exchange (PeX) compatible with µTorrent, IP filtering (eMule-like "ipfilter.dat" or PeerGuardian filters), Torrents (and the files they contain) prioritizing, remote control through a secure Web User Interface. The qBittorrent project aims to provide a Free Software alternative to µtorrent. QBittorrent is a multi-platform Bittorrent client developed in C++/Qt4.
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