Is &quot;cheating&quot; in offline, single-player games illegal?
<p>I understand there are laws like the <strong>Circumvention of Technological Measure (CTM), Computer Fraud and Abuse Act (CFAA), Digital Millennium Copyright Act (DMCA)</strong>. According to these laws it's considered '<strong>copyright infringement</strong>' to modify software one does not have the copyright to, which basically stops people from 'hacking' any games or software, but nobody is trying to hack the <strong>Digital rights management (DRM)</strong>. That DRM stuff relates to making keygens and cracking software</p>
<p>I have searched Google and not found any cases anywhere regarding someone being sued for 'cheating' in a Singleplayer (offline) game, but due to the way the copyright laws are worded, there seems to be a grey area surrounding this subject.</p>
<p>Here is something I found in my research: <a href="https://en.wikipedia.org/wiki/Lewis_Galoob_Toys,_Inc._v._Nintendo_of_America,_Inc." rel="nofollow noreferrer">Lewis Galoob Toys, Inc. v. Nintendo of America, Inc. - Source: Wikipedia</a>.</p>
<blockquote>
<p>In her ruling, Smith compared usage of the Game Genie to &quot;skipping portions of a book&quot; or fast-forwarding through a purchased movie; thus the altered game content did not constitute the creation of a derivative work as Nintendo had argued.</p>
</blockquote>
<p>This court case established the legality of using the device &quot;Game Genie&quot; to modify the way a console game is played. But does this legal argument also extend to modifying (or &quot;hacking&quot;) the game binary of a single-player game itself?</p>

<p><a href="/questions/tagged/united-states" class="post-tag" title="show questions tagged &#39;united-states&#39;" rel="tag">united-states</a></p>
<p><strong>There is no one-size-fits-all answer to this question. It depends on the game.</strong></p>
<p>The difference between modding and cheating is largely a matter of semantics. In some cases, cheaters can use facilities which are deliberately built into the game, without modifying it (e.g. cheat codes, console commands, etc.). However, it is difficult to see how making use of such facilities could possibly violate any law, regulation, or agreement, and so the rest of this answer will focus on modding.</p>
<p>I think it would help to walk through two specific examples, to illustrate the broad range of possible answers to this question. Here are the examples I chose:</p>
<ul>
<li><em>The Elder Scrolls V: Skyrim</em> for PC (&quot;<em>Skyrim</em>&quot; for short)</li>
<li><em>Super Mario Odyssey</em> for the Nintendo Switch (&quot;SMO&quot; for short)</li>
</ul>
<p>Both of these games are single player (although SMO has a minor, optional multiplayer component), and both have been extensively modded by their respective communities.</p>
<h2><em>Skyrim</em></h2>
<p><em>Skyrim</em>'s <a href="https://store.steampowered.com/eula/eula_202480" rel="noreferrer">Creation Kit EULA</a> expressly authorizes modding, and the wording implies that mods are the intellectual property of the modder (because it states that the modder automatically grants a license to Bethesda). Bethesda even permits modders to sell <em>Skyrim</em> mods for real money, which is practically unheard of in the video game industry (even under the very restrictive terms which Bethesda sets for such paid mods). Bethesda's open authorization of and acceptance towards modding, and the fact that they deliberately provide modding tools in the first place, makes it very difficult to characterize <em>Skyrim</em> mods as anything other than legal.</p>
<p>However, if you try to circumvent Steam's DRM, or sell mods for money without going through Bethesda's paid mods program, then you are certainly violating one or both of the EULA linked above and the <a href="https://store.steampowered.com/subscriber_agreement/" rel="noreferrer">Steam EULA</a>. Such violation could subject you to civil liability under a variety of legal theories, but in practice, the most likely outcome is that Valve terminates your Steam account (as the Steam Subscriber Agreement says they can) and you lose all the games you previously purchased. But they're not going to waste their time suing you, unless you somehow make a nuisance of yourself.</p>
<p>Paid mods, outside of Bethesda's system, might even be criminal copyright infringement, although I would be rather surprised if it were actually prosecuted as such (the DOJ generally has more important things to worry about, and copyright infringement can't be prosecuted at the state level). If you're willing to call civil liability and unlikely-to-be-prosecuted criminal liability &quot;illegal,&quot; then <em>Skyrim</em> modding can be illegal if you violate the terms and conditions.</p>
<p>One other thing: The terms linked above also say that mods (&quot;New Materials&quot;) can only be distributed &quot;to other authorized users who have purchased the Product, solely for use with such users’ own authorized copies of such Product and in accordance with and subject to the terms and conditions of this Agreement and all applicable laws.&quot; In other words, you are not supposed to distribute mods to users of pirated copies, which is probably impractical to enforce in any meaningful way (modding sites generally make no effort to verify that individual users have actually purchased the game, although in theory it might be technically possible to do so). In my experience, modders are often quite hostile to users of pirated copies of <em>Skyrim</em>, because such copies are nonstandard and more difficult to support. Bethesda evidently views this in-practice hostility as &quot;good enough.&quot;</p>
<h2>SMO</h2>
<p>SMO is a completely different ballgame. Nintendo does not provide modding tools for either the game or the console on which it runs. Furthermore, Nintendo has repeatedly updated the console to prevent people from modding it, and to break or render ineffective existing techniques for such modding. Their stated rationale for this activity is to prevent users from running pirated games on their consoles. Therefore, this brings the whole thing into the scope of the DMCA's infamous anti-circumvention provisions. <a href="https://www.law.cornell.edu/uscode/text/17/1201" rel="noreferrer">17 USC 1201</a> provides that:</p>
<blockquote>
<p>(a)<br />
(1)<br />
(A) No person shall circumvent a technological measure that effectively controls access to a work protected under this title. The prohibition contained in the preceding sentence shall take effect at the end of the 2-year period beginning on the date of the enactment of this chapter.</p>
<p>[...]</p>
<p>(3) As used in this subsection—<br />
(A) to “circumvent a technological measure” means to descramble a scrambled work, to decrypt an encrypted work, <strong>or otherwise to avoid, bypass, remove, deactivate, or impair a technological measure, without the authority of the copyright owner</strong>; and<br />
(B) a technological measure “effectively controls access to a work” if the measure, in the ordinary course of its operation, requires the application of information, or a process or a treatment, with the authority of the copyright owner, to gain access to the work.</p>
</blockquote>
<p>It doesn't matter whether you are trying to commit piracy or not. It only matters that:</p>
<ol start="0">
<li>You &quot;avoid, bypass, remove, deactivate, or impair a technological measure,&quot; and</li>
<li>The technological measure &quot;effectively controls access to a work&quot; as defined above, and</li>
<li>You did it without Nintendo's permission, and</li>
<li>Your action doesn't fall under one of the permanent exceptions listed in 17 USC 1201, nor under any of the 3-year exceptions which the Librarian of Congress is authorized to temporarily grant.</li>
</ol>
<p>So by breaking the DRM on the Nintendo Switch, which is a prerequisite for modifying SMO, you necessarily violate 17 USC 1201, unless you fall into one of the exceptions. Of those, the only one which is even colorably relevant is subsection (f):</p>
<blockquote>
<p>(f)<br />
(1) Notwithstanding the provisions of subsection (a)(1)(A), a person who has lawfully obtained the right to use a copy of a computer program may circumvent a technological measure that effectively controls access to a particular portion of that program for the sole purpose of identifying and analyzing those elements of the program that are necessary to achieve interoperability of an independently created computer program with other programs, and that have not previously been readily available to the person engaging in the circumvention, <strong>to the extent any such acts of identification and analysis do not constitute infringement under this title.</strong></p>
</blockquote>
<p>(&quot;This title&quot; means Title 17, which is the entire copyright law of the United States.)</p>
<p>This is basically saying that you can bypass DRM for the limited purpose of making &quot;an independently created computer program&quot; interoperate with &quot;other programs.&quot; The problem here is that most mods are going to be derivative works of some kind, and just creating a derivative work, even if you never distribute it, is generally copyright infringement under <a href="https://www.law.cornell.edu/uscode/text/17/106" rel="noreferrer">17 USC 106</a>. And the exception-to-the-exception is that it doesn't apply whenever you infringe any copyright, regardless of whether the DRM was intended to prevent you from committing that specific act of infringement or not.</p>
<p>There is some room for debate over whether mods can or should be considered fair use, which is beyond the scope of this discussion. Suffice it to say, it's a complicated, fact-specific inquiry, which is not compatible with sweeping &quot;modding is legal/illegal&quot; statements. We also don't have much good case law for it. Regardless, the <a href="https://en-americas-support.nintendo.com/app/answers/detail/a_id/48058/%7E/nintendo-switch-family%3A-user-agreement" rel="noreferrer">Switch's EULA</a> expressly prohibits modding, and so you would still be liable for a contractual violation anyway.</p>

<p>The answer, of course, is &quot;it depends.&quot;
I can see at least 3 main issues here.  They are as following:</p>
<ol>
<li><p>Is there any type on <strong>encryption</strong> that is used to protect the information the user would need to access in order to cheat?  If there is, then they can (in theory) be sued for violating DMCA.  Any claims about the strength of the encryption (or lack of it) would be claims about facts of the case (and not about the law).  So they would have to be resolved by the finder of fact (e.g. a jury at a trial).</p>
</li>
<li><p>Was there a contract which stipulated that using a licensed copy of the game implies a promise not to reverse-engineer the game?  If there was such a clause in the license agreement, then distributing a cheat device (whether software or hardware) would be a form of <strong>tortious interference.</strong></p>
</li>
<li><p>Do you plan to purchase (or download for free) the device that does this or do you plan to <strong>distribute</strong> it?<br />
(a). The modified version of the game would be derivative work under the copyright law.  To extend the book analogy from the quote you found, it would be akin to reading a book with the pages of the book removed (rather than skipping the pages in a book which still contains the pages).  However, copyright law only deals with distribution of copied or derivative works -- not with consumption of such works.<br />
(b). A different user, in a <a href="https://law.stackexchange.com/a/72917/11306">response</a> to a <a href="https://law.stackexchange.com/q/72915/11306">different question</a> had made the claim that a simple modification of RAM would likely not be considered a derivative work because such prohibition (in a contract) would be considered &quot;an unconscionable clause and void.&quot;<br />
(c). Does distributing a device which automatically creates a derivative work, out of the original, amount to distributing a derivative work?  Unless there is a clear litmus test for it, it would be a decision on the <strong>facts</strong> of the case (and would be decided at trial if it gets that far).</p>
</li>
</ol>

copyright software licensing terms-of-service fair-use