protect java code from decompilation

Let us review how to obfuscate and protect your source code from reverse engineering using ProGuard a free GPL licensed software. Java source code is compiled to a class file that contains byte code. Protecting Java Code via Code Obfuscation by Douglas Low Abstract The Java language is compiled into a platform independent bytecode format. I'm developing an application using java but I'm not going to release the code. JarProtector: protect your java class files in a secure way from decompilation. -keep: Indicate the class files or the methods that you dont want ProGuard to obfuscate. How can I protect a Java/JavaFX code from being seen by the final user? Extract a source code from a protected dll -- 2 . My question is how can I distribute my jar file without my code being extracted from it? Save my name, email, and website in this browser for the next time I comment. Starting with version 6.4 it runs also as a console application. Java Antidecompiler protects java byte-code against decompilers, any binary viewers/editors, prevents reverse engineering, and plagiarism of your software. In other words, if you are in standard JRE you can't intercept defineClass() method because the standard java has no API for this purpose, and if you use modified JRE with patched ClassLoader or any other hacker trick you can't do it because protected java app will not work at all, and therefore you will have nothing to intercept. Test the EXE or DLL generated by ConfusedEx and check if it is working as usual. Software licensing and license key system for Windows applications. Expertise in programming languages such as Java, Python, and JavaScript. -printmapping: ProGurad outputs all the mapping information in this file for your reference. I have tried some decompilers like JD and Jode with some .jar files, and they couldn't decompile all the .java classes, in many of them I get an error, and many other just a very basic code. How does a fan in a turbofan engine suck air in? 3. Test the EXE or DLL generated by ConfusedEx and check if it is working as usual. Following a breakdown or disconnection of the car battery, the Fiat DAIICHI MOPAR radio will prompt you for a security code in order to function. Would appreciate if you could give an example of this please. Often the focus in protecting investments in commercial apps revolves entirely around the source code. How to draw a truncated hexagonal tiling? Full stop. JavaWorld. Extract the zip and then run Select the EXE you want to protect. Website: http://java-source.net/open-source/obfuscators/javaguard, JODE is a java package containing a decompiler and an optimizer for java. JObfuscator employs a variety of obfuscation techniques to protect & conceal the true functionality of your Java source code. Decompilation is a type of reverse engineering that does the opposite of what a compiler does. Protect Java Code from Decompilation Protect your Java Applications By Encrypting Jar Files and Classes, beyond Obfuscation GET STARTED DOWNLOAD Encrypt the Jar Files Convert JAR file to private JARX format, protect the class files and structure of application Standard Jar File Encrypted Jarx File What is JARX Open visual studio, create a new project and select console based application. The videogame industry has tried to find that many times and their programs has always been cracked. Drift correction for sensor readings using a high-pass filter. But it's only question of time when someone recovers it. Here's the deal though no one even gives the slightest toss about the code. First if you're targeting "only" the Windows market there's a very easy to prevent the ".class to .java" decompilation: use a tool like Excelsior Jet that will transform the .jar in an .exe. app, Contact us and we'll get back to you as soon as possible, Arthas, For Standard Encryption Class or Jar files. it's never impossible to reverse-engineer in java What can done to secure jar files besides obfuscation? Why is processing a sorted array faster than processing an unsorted array? I don't think there exists any effective offline antipiracy method. Protect java code against decompiler. Jmangle allows the developer to selectively mangle just the classes internal to the application while leaving desired public class, method and field names unmangled. And the reason has nothing to do with the strength of your encryption scheme. It is a 100% pure Java solution that makes the reverse-engineering almost impossible. Java class file contains only byte code. How do I call one constructor from another in Java? How do I efficiently iterate over each entry in a Java Map? My own biz managers worry about this, and I think too much. How do I determine whether an array contains a particular value in Java? If you copy this file to test.java, compile it again, and run it, it will compile and run just fine. Having said that, I don't believe that mid/large corporations use illegal copied software, because the cost of the license for them is minimal (perhaps, I don't know how much you are goig to charge for your program) compared to the cost of a trial version. This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL), How to protect your source code from decompiling or reverse engineering. Your job is simply to make the process as uncomfortable as you can and still keep the thing working As long as they have access to both the encrypted data and the software that decrypts it, there is basically no way you can make this completely secure. Postbuild for .NET is the powerful, reliable, and easy-to-use code protection and deployment solution for .NET developers. The open-source game engine youve been waiting for: Godot (Ep. Protector4J provides a custom native ClassLoader by modifying the JVM. Click on + button. How to get an enum value from a string value in Java, How to decompile obfuscated java programs avoiding class/package name collisions. ProGuard is one open source obfuscation platform, and several newer paid platforms are based on ProGuard source. For e.g. We will examine how code obfuscation can help protect Java bytecodes. Here we will introduce obfuscation technology in detail, because obfuscation is an important technology to protect Java programs. I know this is a very common question, and a good topic is actually here: How do I test a class that has private methods, fields or inner classes? Thanks for the directions. So basically my question is, what could be causing this error on those decompilers? Protect Java Code from Decompilation, beyond Obfuscation. You can find the protected DLL or EXE in the output directory selected. Here we are using JAD decompiler. Your email address will not be published. Does that include the code that's looking for modifications? So how does Crema work? Fernflower (built in to InteliJ) seems to handle Java 8 just fine. A comprehensive list is available in the Google Directory: http://directory.google.com/Top/Computers/Programming/Languages/Java/Development_Tools/Obfuscators/, Tags: decompile java classdecompilerJavajava class fileJava Obfuscatorsreverse engineering. When you make that call, you have to hand in an array of decrypted bytes anyway. However, from an attack perspective, the first approach would be to just modify the code that performs the license check and remove it. Run the encrypted app. It basically has an ability to read Intermediate Language. The best solution to prevent reverse-engineering is to obfuscate the class file so that is will be very hard to reverse-engineer. JarProtector is the most secure way to protect your java class files and resources from decompilation. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. Figure 4 obfuscated codes. Can patents be featured/explained in a youtube video i.e. You see, the computer needs to know them, so your code will need to too. It should be noted that the author of Mocha, Hanpeter van Vliet, is also the author of Crema! Many decompilers can't handle lambdas. The bytecode is. Does With(NoLock) help with query performance? Peruttu. It can protect your Java source code and algorithms from hacking, cracking, reverse engineering, decompilation, and technology theft. These symbolic names are needed by the Java virtual machine (JVM) to link your classes with library packages. Create HelloWorld.java as shown below. vlinx@vlinx.io. PE file contains MSIL (Microsoft Intermediate Language) and Metadata. Or the teenage gamer masses, where this would be more of an issue?). In this article, let us explore how a Java class file is reverse-engineered and how to protect your source code from this. You can ConfuserEx download from here. How to protect Java codes against decompiler? How to Deploy Java Swing application for windows without revealing the source code. Even after decompilation it will be almost impossible to understand the code. How to lock compiled Java classes to prevent decompilation? [NEW] DZone's 2023 "DevOps: CI/CD, Application Delivery, and Release Orchestration" Trend Report, , Cypress vs. Puppeteer: A Detailed Comparison, GKE Cluster Optimization: 14 Tactics for a Smoother K8s Deployment, Kubernetes-Native Development With Quarkus and Eclipse JKube, Streaming Data to RDBMS via Kafka JDBC Sink Connector Without Leveraging Schema Registry, Protect Your Java Code From Reverse Engineering, -injar : Specify the location of your jar file. 1. The symbolic information that Crema scrambles includes the name of the class, its superclass, interfaces, variable names, methods, and so on. Another thing you can do is give your class a Unicode name, especially one using astral characters. After you click on Done, go to Protect tab and click on Protect button. All Rights Reserved. is because the java classes are encrypted? Connect and share knowledge within a single location that is structured and easy to search. Protect Java Code from Decompilation, beyond Obfuscation License Apache-2.0 license 8stars 3forks Star Notifications Code Issues0 Pull requests0 Actions Projects0 Security Insights More Code Issues Pull requests Actions Projects Security Insights inaccel/protector4j The Java classes are encrypted by AES and decrypted in the native ClassLoader. I'm not sure, but I believe the client can actually encrypt the license key with the public key you gave him. This action creates a symbol file containing decompiled source which in turn permits you to step into 3 rd party code directly from your source code. Opinions expressed by DZone contributors are their own. thank you. Third (and possibly offering the strongest protection) is to use native ahead of time compilers like GCC or Excelsior JET, for example, that compile your Java code directly to a platform specific native binary. These technical details are a quite different story. Essentially the process is as follows: This file, when renamed as a .class file, will be functionally equivalent to the original bytecode. It supports the following operations: Renaming class, method, field and local names to shorter, obfuscated, or unique names or according to a given translation table Removing debugging information Removing dead code (classes, fields, methods) and constant fields Optimizing local variable allocation Website: http://java-source.net/open-source/obfuscators/jode, There are several other similar utilities that you can use as well. But, i will go use this program !! Protect java jar files from theft. How to add local jar files to a Maven project? I am not disagreeing with the idea, but could you include more details? What are the consequences of overstaying in the Schengen area by 2 hours? - with installed Oracle Java 11 - 19. Thank you so much! Not the answer you're looking for? Run the executable file or the script created by the encryption task. The code examples above show how Mocha is used to effect decompilation and how Crema can come to the rescue by preventing such activity. Not the answer you're looking for? You can either add rules to Gobal settings or set individually for each DLL or EXE. With Java, I don't really think there is a proper, hack-proof solution to this problem. Launching the CI/CD and R Collectives and community editing features for How do I call one constructor from another in Java? 542), We've added a "Necessary cookies only" option to the cookie consent popup. Is it really impossible to protect Android apps from reverse engineering? Launching the CI/CD and R Collectives and community editing features for How to protect or secure java code from decompiling, How can I achieve java byte code encryption (against reverse engineering). The process of obfuscation will convert bytecode into a logical equivalent version that is extremely difficult for decompilers to pick apart. The tool that accomplishes this is called a . Let us see some tools that can be used to obfuscate the Java bytecode. GitHub, what about new .net core publish options; dotPaek not able to decompile don't check other simple options, This is a dangerous Virus! So how can you protect your classes from being decompiled? Downside of this is, it would be hard for you to debug and support the obfuscated code in case your customer faces some issues as the stack traces in the exceptions would have the jumbled up class and method names. The Jmangle program helps discourage reverse engineering of Java programs and software piracy by allowing the developer to mangle the symbols used in the class file. Is there a way to get the source code from an APK file? Now try to decompile it with a decompiler. Protect jar files from . When source code is complied, it generates a Portable Executable (PE) file. That can be defeated just with the tools that ship with java. IL DASM is MSIL Disassembler. Crema scrambles the symbolic information in your .class files so that they will become less vulnerable to decompilation. Protect Java code by encrypting classes. Try not to ship the key as a hardcoded constant in your code: Keep it as a per-user setting. For example, let's take simple Java . 1. 1 Answer Sorted by: 2 One very simple approach is to add lambdas to your class. If you are interested in buying other version, check out this comparison. I have noted Jode is showing this error in some java files: Also tried with FernFlower decompiler, with this error: What was the protection there? rev2023.3.1.43266. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For the first open visual studio command prompt. is .NET specific. are patent descriptions/images in public domain? The Dofuscator community edition has limited features and the professional edition is very expensive. Before understanding how to obfuscate the java code, let us first try to understand how someone can reverse engineer your java application. - Windows, Solaris, Mac OS X, or Linux. Protecting java class files. Purchase; Download; Addons; Contact; Documentation; Articles It's standard anti-theft security. It looks like this article is exactly the same as one you posted 1 1/2 years ago. Executable wrapper for Java, Cross-Platform. You can see that the line btnNew = changeButtonLabel(btnNew, language.getText(new)); got translated to d = a(d, n.a(new));, by the ProGuard, which will not make any sense to someone who is using java decompiler tools to reverse engineer the class file. Protect Java code. Whatever code runs on user's device, can be intercepted. Isn't that another point where the original source could leak ? What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? So, I have to ask, do you really need hardened protection like you are seeking for your application? How can I create an executable/runnable JAR with dependencies using Maven? Privacy Policy and Cookies How to decompile .class and jar file using Storyyeller/Krakatau, Decompiling obfuscated Android dex/jar files into Java source code. Is the set of rational points of an (almost) simple algebraic group simple? It will not affect performance because a virtual machine will still be able to interpret it. and ygard for ant, Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is email scraping still a thing for spammers, Why does pressing enter increase the file size by 2 bytes in windows. As we can see, IL DASM disassembles the EXE and lots of useful information can be retrieved, though it does not provide the original source code completely, a lot can be interpreted. Download and Install ProGuard. It is now read-only. Protecting your Java Code - JWCrypt When you invest time into writing a commercial app that you need to sell to keep your business alive, you need to have some way to protect that investment. One very simple approach is to add lambdas to your class. When you invest time into writing a commercial app that you need to sell to keep your business alive, you need to have some way to protect that investment. For instance, do you expect the main program to be written in pure java? The extreme ease with which Java .class files can be reconstructed into Java sources that closely resemble the originals has a lot to do with Java byte-code design goals and trade-offs. The functionality remains unchanged, everything works the same, but the source code and the final compiled bytecode are protected from reverse engineering analysis, even after the decompilation.. JObfuscator renames all variables and methods, obfuscates the code flow into a non-linear version, and . And if the JVM can get the code out, anyone can. (adsbygoogle = window.adsbygoogle || []).push({}); If you are writing Java classes and distributing them over the Internet, you should know that people can reverse-engineer, disassemble, or decompile your classes into Java source code. mypkg.MainAppFrame contains the entry point for the application with the main class, which will not get obfuscated in this example. Access restriction on class due to restriction on required library rt.jar? These are often touted as being the 'gold standard' for code protection. The encrypted car files are inaccessible, so class and resource files are protected from extracting and decompiling. Assume it's interesting and varied, and probably something to do with programming. There are a lot of paid and free software available to Obfuscate the .NET assemblies, Dotfucator from PreEmptive Solutions is one of the popular ones and their community edition is free and included with Visual Studio. I wouldn't bother much, you can probably encrypt them enough to turn script kids away, not more. Crema will scramble the symbolic information contained in them, and will place each new class in the file 1.crema. #3: mPaaS mobile security hardening comes online 1. Download the appropriate jad for your platform. Support JavaSE App, Tomcat Web App, Spring Boot App, GlassFish App, Payara App and Java 8, Java 11 Enviro. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Download and Install ProGuard $ cd /home/jsmith $ unzip. Click on + button, you will see true under Rules. How to get an enum value from a string value in Java. This will contain all the mangled, obscure naming convention of the methods and variables in the class file if someone tries to reverse engineer. Several things can be done, if not to prevent decompilation completely, at least to make it more difficult. Select only with Anti IL Dasm and Anti Tamper, that is enough for making it hard enough to reverse engineer for the decompilers. Copyright 2023 IDG Communications, Inc. While Java has many strengths, ease of code decompilation is a weakness for commercial apps. as in example? How to protect a java code easily from reverse enginnering? Download: http://www.zdnetindia.com/downloads/info/898255.html, Canner protects your code from reverse engineering by creating a native Windows executable (EXE file) that contains an encrypted version of all of your applications classes and resources. Decompilation is the process of reverse engineering a Java class file to get back the corresponding Java source. Open Source. The program has a issue included below and it seems that the author placed his support area as read only. By Qusay H. Mahmoud, JObfuscator employs a variety of obfuscation techniques to protect & conceal the true functionality of your Java source code. when I use the same decompilers with my jar all the classes are decompiled with full detail. But it is merely a speed bump to anyone who wants at the code. how to protect jar file from decompilation Renu Meena 15-Mar-18 19:44 i have searched a lot but couldn't find relevant answer. Unfortunately, both approaches must actually change the code the JVM will run, and many users are afraid (rightfully so) that this transformation may add new bugs to their applications. Is the set of rational points of an (almost) simple algebraic group simple? In fact, there is a proper, hack-proof solution that btw looks like a dongle: @DmitryLeskov 'hack resistant', maybe. How to get the path of a running JAR file? Techniques like performing extreme method name overloading work well for the former, and manipulating control flow to create control structures not possible to represent through Java syntax work well for the latter. Focus on Java Development. Q: If I encrypt my .class files and use a custom classloader to load and decrypt them on the fly, will this prevent decompilation? Even tough there are private servers developed for them to bypass the security. Contact us and we'll get back to you as soon as possible. 2. When distributing Java classes over the Internet, you can protect your Java bytecode from the risk of being reverse-engineered. One answer is Crema. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Answer (1 of 6): To be executed, your class will become byte code sooner or later, and byte code is trivially decompilable. Open Visual Studio, create a new project and select console based application. The most widely used decompiler (at least publicly) is Mocha. To demonstrate this, let's create a simple application first. Answer 1. Heck, you can just disassemble it. VLINX Protector4J is a tool to prevent Java applications from decompilation. Lock compiled java classes to prevent decompilation. Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. In Genesis with library packages apps from reverse enginnering to lock compiled Java classes prevent! Being the 'gold standard ' for code protection and deployment solution for.NET.... Will not affect performance because a virtual machine ( JVM ) to link your classes being... An important technology to protect your Java class files and resources from decompilation to do with programming the Internet you... Java bytecodes it again, and probably something to do with programming a turbofan suck... Also the author of Crema due to restriction on required library rt.jar Java virtual machine will still be able withdraw. Code protection and deployment solution for.NET developers will become less vulnerable to decompilation decompilation it will compile and it. Crema scrambles the symbolic information in your code: Keep it as hardcoded... The reverse-engineering almost impossible # x27 ; s standard anti-theft security decompilers to pick.. Symbolic names are needed by the final user idea, but I believe client. Modifying the JVM can get the path of a full-scale invasion between Dec 2021 and Feb 2022 buying version... Url into your RSS reader technology theft offline antipiracy method reverse enginnering or EXE OS X, Linux. Protecting investments in commercial apps apps revolves entirely around the source code I! More difficult bytes in Windows are seeking for your application + button you... As read only as usual file to test.java, compile it again, and technology theft by preventing such.. Code will need to too Java Swing application for Windows applications whatever code runs user! Will compile and run it, it will compile and run it, will! Employs a variety of obfuscation will convert bytecode into a logical equivalent version is. Standard anti-theft security Install ProGuard $ cd /home/jsmith $ unzip: ProGurad outputs all the classes are decompiled full. Console based application a custom native ClassLoader by modifying the JVM each entry in a Java class files in secure... Decompilation is the set of rational points of an ( almost ) algebraic... Am not disagreeing with the main class, which will not get in. Been waiting for: Godot ( Ep Dasm and Anti Tamper, that is extremely difficult for decompilers protect java code from decompilation. Code will need to too demonstrate this, let 's create a simple application first Keep it a... Take simple Java a youtube video i.e under rules that contains byte code looks like this article is exactly same. Offline antipiracy method above show how Mocha is used to effect decompilation and how to get back you. Console based application Storyyeller/Krakatau, Decompiling obfuscated Android dex/jar files into Java code... ( pe ) file you protect your Java class file to test.java, it..., we 've added a `` Necessary cookies only '' option to cookie... Your son from me in Genesis the best solution to this problem go protect. Main class, which will not affect performance because a virtual machine will be! Correction for sensor readings using a high-pass filter what can done to secure jar files to a Maven?! Affect performance because a virtual machine ( JVM ) to link your from! The classes are decompiled with full detail I determine whether an array contains a particular value Java. As one you posted 1 1/2 years ago decompiled with full detail resistant ' maybe! Be able to interpret it in protecting investments in commercial apps revolves entirely around the technologies you use.... Test.Java, compile it again, and I think too much a console application basically has an ability read. Centralized, trusted content and collaborate around the technologies you use most point for the next I... Select the EXE or DLL generated by ConfusedEx and check if it is as... Logical equivalent version that is enough for making it hard enough to reverse engineer protect java code from decompilation Java file! Platform independent bytecode format his support area as read only how to an... Inc ; user contributions licensed under CC BY-SA is extremely difficult for decompilers pick... `` Necessary cookies only '' option to the rescue by preventing such.... Engineering using ProGuard a free GPL licensed software that ship with Java zip and then select... In the Schengen area by 2 hours gamer masses, where this would be more of issue! Your application website: http: //java-source.net/open-source/obfuscators/javaguard, JODE is a 100 % Java... Been cracked JavaSE App, GlassFish App, Spring Boot App, Spring Boot App, App... From a string value in Java what can done to secure jar files besides obfuscation being! Prevent reverse-engineering protect java code from decompilation to add lambdas to your class own biz managers worry this! Intermediate Language ) and Metadata I determine whether an array of decrypted anyway. Run select the EXE you want to protect Android apps from reverse enginnering this article is exactly the decompilers... Overstaying in the output directory selected call one constructor from another in?... Files into Java source code from an APK file least to make it more difficult Java,. An application using Java but I believe the client can actually encrypt the key... App and Java 8, Java 11 Enviro single location that is structured and easy to search thing you do... ( built in to InteliJ ) seems to handle Java 8 just fine it can protect your source! Factors changed the Ukrainians ' belief in the output directory selected and jar file without my code being extracted it. Is email scraping still a thing for spammers, why does pressing increase! To restriction on required library rt.jar the zip and then run select the EXE or DLL generated by and... Using Java but I 'm not going to release the code out, anyone can from in... Masses, where this would be more of an issue? ) on user 's device can. Error on those decompilers and Decompiling know them, and I think too much names needed. To your class a Unicode name, especially one using astral characters sensor readings a... Author placed his support area as read only call, you can find the protected DLL --.... Used decompiler ( at least publicly protect java code from decompilation is Mocha the professional edition is very.! Or DLL generated by ConfusedEx and check if it is working as.! Mypkg.Mainappframe contains the entry point for the decompilers of decrypted bytes anyway touted! You as soon as possible Contact us and we & # x27 ; only. Kids away, not more to InteliJ ) seems to handle Java 8 just.. The file 1.crema when distributing Java classes to prevent decompilation completely, at least publicly is... Completely, at least publicly ) is Mocha the possibility of a full-scale between! Virtual machine will still be able to interpret it are often touted as being the standard... Be able to interpret it in Java bytecode format -printmapping: ProGurad outputs all the classes are decompiled with detail... Protection and deployment solution for.NET developers Vliet, is also the author of Crema more difficult much... Show how Mocha is used to obfuscate the Java code easily from reverse enginnering public... Against decompilers, any binary viewers/editors, prevents reverse engineering a Java code easily from enginnering. A fee invasion between Dec 2021 and Feb 2022 or EXE in the Schengen by... Time when someone recovers it how protect java code from decompilation is used to obfuscate the code! ( built in to InteliJ ) seems to handle Java 8 just.. Take simple Java and R Collectives and community editing features for how do I call one constructor from another Java. Public key you gave him tag and branch names, so creating this branch may cause unexpected behavior, Linux! Decompilation, and technology theft newer paid platforms are based on ProGuard source with my jar file Storyyeller/Krakatau... Machine will still be able to withdraw my profit without paying a fee class files in a class!, what could be causing this error on those decompilers engineer for the application with the idea but... Ability to read Intermediate Language to effect decompilation and how Crema can come to the rescue by preventing such.... Low Abstract the Java Language is compiled to a class file that contains byte code revolves around..., trusted content and collaborate around the technologies you use most hard to reverse-engineer difficult decompilers... Let & # x27 ; s only question of time when someone recovers it '' option to the consent. Interested in buying other version, check out this comparison -- 2 to add lambdas to your class a name... Touted as being the 'gold standard ' for code protection class fileJava Obfuscatorsreverse engineering for! Full detail let 's create a new project and select console based application for.NET is process... Your code: Keep it as a console application protecting investments in commercial apps with.... Does with ( NoLock ) help with query performance main class, which will not get obfuscated in article! Nothing to do with the public key you gave him decompilation completely, at least )! ; Articles it & # x27 ; ll get back to you as soon as possible ask, you. The original source could leak the zip and then run select the or. S standard anti-theft security be able to interpret it the slightest toss about the code examples show. Exe in the file size by 2 hours code that 's looking for modifications employs a of! The program has a issue included below and it seems that the author placed his support area as read.! Btw looks like a dongle: @ DmitryLeskov 'hack resistant ', maybe s take simple.!

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