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A server emulator, also called Freeshard or Private server, is the reimplementation of online game servers, typically as clones of proprietary commercial software by a third party of the game community. The private server is not always made by the original company, but usually attempts to mimic it in some way.
Technically, a server emulator does not emulate by the traditional definition. Instead it is the alternative implementation of the proprietary gaming server that communicates with the same gaming client through the same, reverse-engineered proprietary protocols. Server emulators exist for many online games. If the original proprietary servers were shut down, server emulators can be considered community continuations as fix for an orphaned software product.
Unlike in cases of phishing, the emulator usually does not try to steal identity of the legitimate server. Original server software that is stolen, like AEGIS, is also not a server emulator. Reimplementations of standardized protocols or server behavior is not considered to be emulation.
According to a study based on Ragnarok Online emulated servers, “Players turn to the illegal private server solution to fulfill their expectations for better means of avatar customization, specific technical features, an improved social environment, and enhanced gamemaster availability.”  Other reasons why players use server emulators is to avoid the monthly fees or purchasing fees for certain games, as well as to experience an accelerated and/or altered mode of play. Some server emulators are designed on the emphasis that a game has closed, like Toontown Online.
Emulating the server of the proprietary commercial game often violates EULA as many commercial MMORPGs require the user to sign a clause not to create or use server emulators. Additionally, many server emulators retain portions of the original code, and thus violating copyright law. Examples of such violations include the popular RuneScape emulator Winterlove—which retained decompiled, unauthorized portions of the original game client. The server may try to avoid violations by serving from the country where some intellectual property laws possibly apply differently or not at all. Typically, the locations chosen rarely differ enough in copyright and patent law to protect the individual(s) behind the emulator. Examples of these offshore misconceptions include the popular hosting choice that is the Netherlands.
Another issue is a possible infringement of the game creator's copyright. If the complete emulator is a work of its own, copyright violation is not as obvious as EULA violation (see Lotus v. Borland case). However sometimes the original server software leaks out of the company that created the game, for example AEGIS (Ragnarok Online). Use or distribution of leaked code is widely held to be copyright infringement. There are cases where a game creator has effectively shut down private game servers by threatening lawsuits due to intellectual property violations, such as offering a modified client (see information on NEXON v OdinMS) for download or offering downloads of modified files from the original game package.
In August 2010, a California Central District Court awarded Blizzard Entertainment $88 million in a lawsuit against Scapegaming over copyright-infringement. Scapegaming’s violation involved operation of an unauthorized copyrighted version of World of Warcraft. Scapegaming ran microtransactions encouraging players to donate money to advance in the game resulting in $3,053,339 of inappropriate profits. This is one of the first big cases implemented against server emulation.
In July 2011, Nexon has threatened to take MMORPG development community RaGEZONE to court over users creating and sharing custom emulated servers. Nexon claims to file legal proceedings against all parties involved in the MMORPG development scene. Disney has also fought against server emulators for its MMO Club Penguin, resulting in the closure of iCPv3 in October 2010, which had over 100,000 users when Disney filed a cease and desist notice against the emulator.
In late 2011, the online chatbox provider xat filed a lawsuit after a developer published a copy of the source code to her server emulator. The suit was later dropped as the developer had not infringed copyright.
-  - Announcement of a Star Wars Galaxies server emulator on slashdot.
-  - RaGEZONE announcement on Nexon and legal proceedings.
- Hafer, T.J. (2012-11-19). "Community-made Forged Alliance Forever keeps Supreme Commander multiplayer alive". PC Gamer. Retrieved 2014-08-28.
The official multiplayer servers for Supreme Commander: Forged Alliance have been decommissioned for a while now, but fortunately [...] the community-driven Forged Alliance Forever has emerged. The self-patching multiplayer client allows players of the epic real-time strategy title to continue blowing things up in massive quantities. In addition to the regular patches and fixes, it also adds new units, a new faction, and some game modes that weren't available on the official servers, such as 6v6.
- You're in charge! - From vital patches to game cancellations, players are often intimately involved. by Christian Donlan on Eurogamer "Supreme Commander fans released Forged Alliance Forever and gave the game the online client it could otherwise only dream of. I haven't played it much, but I still got a tear in my eye when I read about the extents these coders had gone to. There's nothing quite so wonderful to witness as love, and this is surely love of the very purest order. [...] SupCom guys resurrect a series whose publisher had just gone under." (2013-11-02)
- "BattleForge Reborn - Community will das Spiel wiederbeleben". GameStar. Retrieved 2016-06-26.
- Debeauvais, T.; Nardi, B. (2010). "A qualitative study of Ragnarok Online private servers: in-game sociological issues" (PDF). In Proceedings of the Fifth International Conference on the Foundations of Digital Games (FDG’10).
- "Winterlove RuneScape Emulator". Retrieved 2017-05-30.
- "RSBuffer Legal Alternative to Winterlove Stream". Retrieved 2017-05-30.
- "The offshore misconception highlighted throughout emulation communities". Retrieved 2017-05-30.
- Matthew Humphries (17 Aug 2010). "Blizzard wins $88 million from Scapegaming over illegal WoW servers". Retrieved 2014-10-23.
- "iCPv3 is Gone? – New iCP?". 18 Oct 2010. Retrieved 23 Oct 2014.