Use of the UDK for noncommercial purposes is free of charge. If you are going to use the UDK for any commercial purpose or in any way that is not specifically authorized in the end-user license agreement (EULA), you must agree to appropriate commercial terms. View our terms.
Whether you’re writing the next blockbuster game or building an internal UDK application for your business, we have a Commercial UDK License to fit your needs. If you’re not sure which license is right for your UDK application, please check out the UDK frequently asked questions.
Absolutely. Download UDK, create your project and distribute it completely free of cost.
Educational institutions can use UDK under our “FREE for educational and non-commercial use” policy, even though they’re charging tuition, and we’d love to have you teaching Unreal Engine 3 as well. No license is required for faculty or students.
Your students are encouraged to use UDK inside or outside of school to learn game development and for any other non-commercial purposes.
If a student, for example, decides he wants to sell a game he made as a school or hobby project he is welcome to do that as well. He would need to purchase our $99 license and then pay us royalties of 25% of his earnings after the first $50,000 he makes.
No. You or your company will only need one commercial license to cover all the UDK based games or commercial applications you develop.
Using crowd funding to help get your UDK game is perfectly acceptable. We do require developers to execute the $99 commercial UDK license as soon as the game becomes a commercial product, whether through direct sale, pre-orders, or a promised “backer reward.” All money received for game copies sold whether through direct sale, pre-orders, or “backer reward” are considered to be part of revenue, and are thus subject to the standard UDK royalty at the market value of the standalone game. Funding earned through donations, non-game backer rewards (e.g., thank you cards, hats, t-shirts), and “fund my life” campaigns, are not subject to UDK royalties. For “backer rewards” that combine merchandise plus a game, only the market value of the game is attributed to total revenue. For example, if you offer a $100 pledge that includes swag and one copy of your $10 game, you only count $10 toward UDK revenue. Any pre-sales of the game are subject to the standard UDK royalty.
No. You do not need a commercial UDK license nor will the assets, content packs or starter kits be subject to the standard UDK royalty.
Scenario 1 – An individual creates a weapon pack consisting of meshes, textures, materials, particle effects and UnrealScript files; everything needed to drop the weapons into UDK for use in developing a game. The individual decides to sell the weapon pack through a content marketplace and earns US$75,000 (after any fees imposed by the marketplace) over a period of several years. No commercial UDK license or royalty is required and the individual keeps the entire US$75,000.
Scenario 2 – A team is creating a real-time strategy game. During development, they decide to sell the framework of the game as a “starter kit” that includes a collection of UnrealScript files and some simple stand-in art assets. The team is not required to purchase a commercial UDK license prior to selling the starter kit; however, the team would be required to purchase a royalty-bearing commercial UDK license prior to selling the full game they are developing. They charge US$150 per asset pack and sell 350 starter kits, earning a total of US$52,500. No royalty payment is required and the team keeps the US$52,500.
Scenario 3 – A technical artist creates freelance art assets (materials, particle effects, etc.) for several different teams all working on games using UDK, which are later sold commercially. The artist is paid a total of US$62,500 for their work. The artist is not required to purchase a commercial UDK license or pay royalties and keeps the whole US$62,500. The teams selling the games using the assets created by the artist are required to purchase royalty-bearing commercial UDK licenses and pay royalties on their revenue over US$50,000.
If you are using Unreal Engine 3 for the first time a good place to start is the Unreal Developer Network. You can visit UDK’s home here: http://udn.epicgames.com/Three/DevelopmentKitHome.html
And the Getting Started with UDK portal is here: http://udn.epicgames.com/Three/DevelopmentKitGettingStarted.html
There are also new “Mastering Unreal Technology” books, authored by 3D Buzz and published by Sams.
Two volumes are currently available: “Mastering Unreal Technology, Volume I: Introduction to Level Design with Unreal Engine 3” http://www.informit.com/store/product.aspx?isbn=0672329913
“Mastering Unreal Technology, Volume II: Advanced Level Design Concepts with Unreal Engine 3” http://www.informit.com/store/product.aspx?isbn=9780672329920
UDK is aimed at anyone who wants to work with Unreal Engine 3, and UDK provides the same professional, world-class tools with which our developers work. UDK isn’t watered down in any way so both beginners and professional developers can use it.
Every time Epic ships a major new PC game, we ship the Unreal Engine tools with it and the mod makers blow us away with their creativity and ingenuity.
What makes UDK different is that it can be used by everyone. You don’t have to own a copy of “Unreal Tournament 3” or “Gears of War” to get access to the engine tools, plus we are continually releasing free UDK updates.
In addition, all UDK releases are standalone products, meaning anyone can release a totally free game that requires no additional software.
The rights to develop and release a game for free are contained in the end-user license agreement (EULA). The EULA is also the license that governs the release of your game as it’s built on UDK. You can’t release your UDK project under terms other than the UDK EULA (like GPL, LGPL, open source, etc.). You don’t have the right to encumber the UDK with terms that we have not already granted to you.
Yes. If the game is absolutely free to play and there is no commercial aspect to it then you’re welcome to do so under the End User License Agreement. But some free games still require a license. If your game is free but is used to advertise a product or service you need a license for that. If your game is free to download and play but you sell content, services or products within your game that also requires a commercial license. If you’re uncertain about whether you require a commercial license or not please email the particulars about your situation to UDKlicensing@epicgames.com and we’ll be happy to answer you.
The primary difference is that UDK does not include Unreal Engine 3 C++ source code access. UDK ships with all the UnrealScript code and Unreal Engine tool integrations as the commercial version of Unreal Engine 3, offering all the same features the pros use.
The tools and technology are the same however a “full” license includes the underlying C++ source code to the engine and tools, which allows licensees to make virtually any change they want and potentially ship their game on consoles provided they’re licensed by the console manufacturer.
Both UDK users and traditional Unreal Engine 3 commercial licensees have access to all UnrealScript source code. UnrealScript is comparable to a programming language like Java in terms of features and performance (byte-compiled), with features designed to simplify game development, e.g., state scoping of functions, automatic serialization, simple system for defining networking replication of properties and remote functions, etc.
There are tons of great materials and support avenues for UDK users, including the two new “Mastering Unreal Technology” books from Sams, hundreds of pages of support items on our Unreal Developer Network (http://udn.epicgames.com), our community forums (http://www.udk.com/forums), and hundreds of hours of free video tutorials from the folks at http://www.3dbuzz.com with a whole bunch more tailored specifically to getting started with UDK in the works right now.
Full UE3 licensees also get direct support from Epic’s engineers who write UE3 code.
Yes, with one exception. You may not release anything marked as a SkeletalMesh in the Content Browser in a commercial UDK application.
Yes, you may alter the static splash screen as you see fit. The UDK movie, on the other hand, must not be changed.
You can interface C++ source via TCP. Basically, you can use UnrealScript and TCP/IP as glue code between the engine and your native code. For more information, visit the Unreal Developer Network here: http://udn.epicgames.com/Three/TcpLink.html
The December 2009 UDK Beta adds the ability for UnrealScript to call functions implemented in a Windows DLL. For more details, visit http://udn.epicgames.com/Three/DLLBind.html.
The short answer is “Yes.” However you need a commercial license. Please view the information at our licensing page.
Commercial release on the PC is already covered and we’ve got great terms at www.udk.com/licensing for those who want to sell games created with UDK for PC.
Console is a little more complicated because you need to be licensed by the console manufacturers before you can get a development kit, which involves a concept submission and (hint, hint!) UDK would be great for proving your worth in the concept submission stage.
If you can get through that step we’re more than happy to talk with you about making a full source code license available under great business terms.
The UDK software is available in the following languages: Chinese (Simplified), English, Japanese and Korean.
We’re in the process of translating the UDK web site into Japanese, Korean and Chinese. Those languages are already supported in the UDK toolset itself and on the Unreal Developer Network (udn.epicgames.com).
Absolutely. The UDK currently supports PC:Windows and iOS in the same build.
You may create “unofficial” UDK documentation provided the following:
You may give away or sell unofficial documentation without a license from Epic. Epic does not charge a royalty fee for unofficial documentation.
If you have any questions about licensing UDK or require custom license terms, source code licenses, or use on consoles please email email@example.com for more information.
The UDK is FREE for educational use. Feel free to use it in your school’s curriculum. Educational institutions can use the UDK for free even though they’re charging tuition. No additional license is required for faculty or students. Your students are encouraged to use UDK inside or outside of school to learn game development.
The UDK is also FREE for non-commercial use. Feel free to use the UDK to make any application (game or othe rwise) for free distribution. No additional license (beyond the EULA) is required. Just go for it.
NOTE: We are extending the US$50,000 royalty-free revenue benefit to all existing UDK commercial licensee. Please click the license link in the license acceptance email we sent you to see the updated terms of your license.
If you use UDK in your business, sell a game or application created using UDK, sell services or training and in connection with that business, distribute an application you’ve created using UDK, or use UDK in any way to generate revenue, directly or indirectly, in addition to your agreeing to the UDK EULA, you are required to sign a UDK Commercial Use License Agreement.
A summary of the current terms of this license are as follows (note that the below terms are only a summary – the actual terms appear in the UDK Amendment):
If you are using UDK internally within your business and the application created using UDK is not distributed to a third party (i.e., someone who is not your employee or subcontractor), you are required to pay Epic an annual license fee of US$2,500 per installed UDK developer seat per year. This license fee only applies to UDK seats used for development; no license fee is required for hardware where only the resulting applications are installed.
If you create a games or commercial applications using UDK for sale or distribution to an end-user or client, or if you are providing services in connection with a UDK based game or application, the per-seat option does not apply. Instead the license terms for this arrangement are US$99 up-front, and a 0% royalty on you or your company’s first US$50,000 in UDK related revenue from all your UDK based games or commercial applications, and a 25% royalty on UDK related revenue from all your UDK based games or commercial applications above US$50,000. UDK related revenue includes, but is not limited to, monies earned from: sales, services, training, advertisements, sponsorships, endorsements, memberships, subscription fees, in-game transactions, rentals and pay-to-play. You or your company will only need one commercial license to cover all the UDK based games or commercial applications you develop.
Here are some examples:
A warehouse company uses UDK to create an application for employee safety training. They develop it on one computer and then install the resulting application on two computers for their internal employees to use. They require a single UDK development seat license for a total cost of US$2,500 per year, for as long as they use UDK to develop and/or maintain the application.
A team creates a game with UDK that they intend to sell. After six months of development, they release the game through digital distribution and they earn US$60,000 in the first calendar quarter after release. Their use of UDK during development requires no fee. At some point prior to the UDK Applications’srelease they would to secure a royalty-bearing commercial UDK license with its US$99 license fee. After earning US$60,000, they would be required to pay Epic US$2,500 (US$0 on the first US$50,000 in revenue, and US$2,500 on the next US$10,000 in revenue). On subsequent revenue, they are required to pay the 25% royalty.
An architecture firm uses UDK to create a live walk-through presentation for their customers. They charge their customers a fee of US$500 for each walk-through. Before they begin to charge customers for the walk-through, they would pay Epic US$99 for a royalty-bearing commercial UDK license. They sell walk-through presentations to 100 customers in the first quarter, bringing in US$50,000 in revenue. No royalty payment would be required to Epic for that first US$50,000. In the second quarter, they sell another 100 walk-through presentations, bringing in another US$50,000 in revenue. They are required to pay US$12,500 to Epic. On subsequent revenue, they are required to pay the 25% royalty.
The UDK Commercial Use License may be executed by an individual or a corporate entity. If an unincorporated team wishes to license UDK, we recommend setting up a simple corporation or partnership for the team before contacting us for a license. If that is not feasible, please designate a single individual to contact us who will be responsible for executing the license and fulfilling the terms.
A note to developers under the age of consent (minors): Please have your parent or guardian contact us for a UDK Commercial Use License, as we cannot enter into a license agreement with a minor.
If you have any questions about licensing UDK or require custom license terms, source code licenses, or use on consoles please email firstname.lastname@example.org for more information.
This End User License Agreement (“Agreement”) is a legal agreement between either you as an individual or the entity you represent (“You” or “Your”), and Epic Games, Inc., a Maryland Corporation located at 620 Crossroads Boulevard, Cary, North Carolina, 27518, U.S.A. (“Epic”). The purpose of this license is to allow You to use the Unreal Engine 3 UDK and any updates thereto provided by Epic (the “UDK”) on the terms set forth below. If You do not agree to the terms of this Agreement, You may not use the UDK.
1. Third Party Software. THE UDK CONTAINS THIRD PARTY SOFTWARE. CERTAIN ADDITIONAL TERMS AND CONDITIONS WITH RESPECT TO SUCH SOFTWARE ARE LOCATED AT THE END OF THIS AGREEMENT. THESE ADDITIONAL THIRD PARTY TERMS AND CONDITIONS ARE MADE A PART OF AND INCORPORATED BY REFERENCE INTO THIS AGREEMENT. IN THE EVENT OF A CONFLICT BETWEEN THE TERMS AND CONDITIONS APPLICABLE TO THE THIRD PARTY SOFTWARE AND THIS AGREEMENT, THE TERMS AND CONDITIONS APPLICABLE TO THE THIRD PARTY SOFTWARE SHALL GOVERN. BY ACCEPTING THIS AGREEMENT, YOU ARE ACCEPTING THE ADDITIONAL TERMS AND CONDITIONS, IF ANY, SET FORTH THEREIN. THE THIRD PARTY SOFTWARE IS ONLY LICENSED FOR USE IN CONJUNCTION WITH THE UDK - ANY OTHER USE IS PROHIBITED.
2. License Grant. Provided that You comply with all terms and conditions of this Agreement, including the License Restrictions in Section 3 below, Epic grants You, for the entire duration of the legal protection of the intellectual property rights of the UDK pursuant to applicable law (subject to Section 7), a limited, personal, non-exclusive, worldwide, non-sublicensable, and non-transferable license to (a) install and use the UDK for the purpose of developing an unlimited number of applications; (b) develop derivative works of the UDK; (c) use derivative works of the UDK developed by You for the purpose of developing an unlimited number of applications; and (d) distribute the applications You develop using the UDK and derivative works of the UDK only in object code form, only as an inseparable part of the applications, and only to end users pursuant to an end user license agreement with terms consistent with and no less protective of Epic’s rights than those contained in this Agreement. This license is being provided to You free of charge.
3. License Restrictions. Epic and its suppliers reserve all rights not expressly granted to You in this Agreement. Unless applicable law gives You more rights despite this limitation, You may use the UDK only as expressly permitted in this Agreement. Thus, You may use the UDK as set forth in Section 2, but You may not:
4. UDK Add-ons. There is no official clearinghouse for UDK add-ons. Add-on software applications are not endorsed by Epic and You use them at your own risk. Epic does not provide instructions for installing add-ons. You may integrate Your add-on software with the UDK and state that your add-on software works with the “UDK™” or “Unreal® Development Kit” only under the following conditions:
You may not combine the add-on with the UDK to make a single shipping product. You may only make Your add-on available separate from the UDK.
5. Ownership. As between the parties, Epic or its suppliers (as described in Section 1) own the title, copyright, and other intellectual property rights in the UDK, including all derivative works of the UDK. You own the title, copyright, and other intellectual property rights in the applications You develop using the UDK and any derivative works thereof, but ownership of the UDK and derivative works of the UDK, and any portion(s) of the UDK and derivative works of the UDK remains with Epic. You agree that Epic may seek and shall be entitled to injunctive, equitable, or other similar relief to protect, maintain, defend, enforce, and preserve such rights, in addition to any other available remedies. If the law of Your jurisdiction provides that You shall be the owner of derivative works of the UDK, You are not allowed to make any use of such derivative work without the prior written explicit approval of Epic, except for permitted uses set forth otherwise in this Agreement.
6. UDK Network. To the extent made available by Epic, You may choose to participate in Epic’s UDK Network. You hereby grant to Epic a non-exclusive, fully-paid, royalty-free, worldwide, perpetual, irrevocable, sublicensable, non-terminable, transferable, assignable license for all known types of use to reproduce, distribute, publicly perform, publicly display, make, sell, import, modify and make derivative works based on, and otherwise use and exploit: (a) any and all information, code and other tangible or intangible materials You post to Epic’s UDK Network or otherwise provide to Epic; and (b) any modifications or additions to the UDK that You provide to Epic via the UDK Network or otherwise provide to Epic, including, without limitation, those which are intended to correct errors or other unwanted and unintended conditions that cause the UDK to fail, malfunction or operate in a manner other than as anticipated. Notwithstanding the foregoing, where applicable, Your statutory rights as an author under the law of Your jurisdiction remain unaffected. To the extent perpetual and/or non-terminable licenses are not permitted in Your jurisdiction, the license granted from You to Epic and described in this Section 5 above shall be for the entire duration of the legal protection of the intellectual property rights being granted to Epic pursuant to applicable law.
7. Export. The UDK is subject to U.S. domestic and international export laws and regulations. You must comply with all applicable export laws and regulations that apply to the UDK. The laws include restrictions on destinations, end users and end use.
8. Termination. Without prejudice to any other rights, (a) this Agreement will terminate immediately without notice from the other party if either party fails to comply with any of the terms or conditions of this Agreement, and (b) Epic may terminate this Agreement at any time, upon notice to You. Upon termination of this Agreement, You must cease all use and destroy all copies of the UDK and all of its component parts, and any documentation related thereto. If You breach this Agreement, and Epic decides to take legal action against You, You shall pay for the reasonable costs of Epic’s attorneys.
9. Other Intellectual Property Matters.
(a) In return for the consideration provided hereunder by Epic, You agree not to assert against Epic any claim, action or proceeding for infringement of any patents, patent rights or other intellectual property rights You may own or control related to any version of the UDK or use thereof.
(b) You agree to indemnify and hold harmless Epic against all costs and expenses (including reasonable attorneys fees and expenses) and all other liability resulting from or related to any claim of patent or copyright infringement, misappropriation, or misuse of trade secrets or other proprietary rights based upon Your use of the UDK, or any portion thereof, in whatever form, or any exercise by You of any rights granted under this Agreement.
10. Entire Agreement; Survival. This Agreement and the terms for supplements and updates that You use, are the entire agreement between You and Epic relating to the UDK and they supersede all prior or contemporaneous oral or written communications, proposals and representations with respect to the UDK or any other subject matter covered by this Agreement. Sections 3, 4, 6, and 9 through 19 (inclusive) survive any termination or expiration of this Agreement.
11. Severability. If any provision of this Agreement is held by a court of competent jurisdiction to be void, invalid, unenforceable or illegal, the other provisions shall continue in full force and effect.
12. Governing Law and Jurisdiction. The laws of North Carolina shall govern the interpretation of this contract and shall apply to claims for breach of it, regardless of conflict of laws principles. All other claims, including claims regarding consumer protection laws, unfair competition laws, and in tort, will be subject to the laws of Your state of residence in the United States, or if You live outside the United States, the laws of the jurisdiction in which You reside. You and we irrevocably consent to the exclusive jurisdiction and venue of the state or federal courts in Wake County, North Carolina, USA for all disputes arising out of or relating to this contract. You further agree that Epic shall be allowed to apply for injunctive remedies (or any equivalent legal relief) in any jurisdiction. For the avoidance of doubt, this Agreement shall be construed and enforced without regard to the United Nations Convention on the International Sale of Goods, which shall not apply to this Agreement.
13. Disclaimer of Warranty. The UDK is licensed “as is.” You bear the risk of using it. Neither Epic nor its suppliers give any express or statutory representations, warranties, guarantees or conditions. Epic and its suppliers also exclude all implied warranties, including any warranty of merchantability, title, durability, fitness for a particular purpose and non-infringement. Nothing in this Agreement shall affect those statutory rights which You are always entitled to as a consumer and that You cannot contractually agree to alter or waive. The limitations and exclusions of liability do not apply if and to the extent (a) You sustain damages which were caused by gross negligence or willful misconduct of Epic, or (b) Epic violates Your life, body, or well-being.
14. Exclusion of Incidental, Consequential, and Certain Other Damages. You can recover from Epic direct damages up to U.S. $25.00 only. You cannot recover any other damages from Epic or its suppliers, including damages for lost profits or data, or consequential, special, direct, indirect or incidental damages. This limitation includes, but is not limited to: (a) anything related to the UDK or services (if any); and (b) claims for breach of contract, breach of warranty, guarantee or condition, strict liability, negligence, or other tort. It also applies even if Epic knew or should have known about the possibility of the damages. The foregoing limitations on liability are intended to apply to the warranties and disclaimers above and all other aspects of this Agreement. The limitations and exclusions of liability do not apply if and to the extent (a) You sustain damages which were caused by gross negligence or willful misconduct of Epic, or (b) Epic violates Your life, body, or well-being.
15. U.S. Government End Users. The UDK and related documentation are “Commercial Items”, as that term is defined at 48 C.F.R. §2.101, consisting of “Commercial Computer Software” and “Commercial Computer Software Documentation”, as such terms are used in 48 C.F.R. §12.212 or 48 C.F.R. §227.7202, as applicable. Consistent with 48 C.F.R. §12.212 or 48 C.F.R. §227.7202-1 through 227.7202-4, as applicable, the Commercial Computer Software and Commercial Computer Software Documentation are being licensed to U.S. Government end users (a) only as Commercial Items and (b) with only those rights as are granted to all other end users pursuant to the terms and conditions herein. Unpublished-rights reserved under the copyright laws of the United States.
16. No Waiver. Any act by Epic to exercise, or failure or delay in exercise of, any of its rights under this Agreement, at law, or in equity shall not be deemed a waiver of those or any other rights or remedies available in contract, at law or in equity.
17. No Support. Neither Epic nor its suppliers has any obligation to provide support services for the UDK or any portion thereof.
18. No Assignment. You shall not, without the prior written consent of Epic, assign, transfer, charge, sub-contract or deal in any other manner with all or any of its rights or obligations under this Agreement. Epic may at any time assign, transfer, charge, sub-contract or deal in any other manner with all or any of its rights or obligations under this Agreement.
19. Legal Effect. This Agreement describes certain legal rights. You may have other rights under the laws of Your jurisdiction. This Agreement does not change Your rights under the laws of Your jurisdiction if the laws of Your jurisdiction do not permit it to do so. Limitations and exclusions of warranties and remedies in this Agreement may not apply to You because Your jurisdiction may not allow them in Your particular circumstance. In the event that certain provisions of this Agreement are not enforceable in Your jurisdiction, such provisions shall be enforceable to the further extent possible under applicable law.
* Unreal Development Kit (UDK) © 2009-2014, Epic Games, Inc. Epic, Epic Games, AnimSet Viewer, AnimTree Editor, Gears of War, Gears of War 2, Unreal, Unreal Cascade, Unreal Content Browser, Unreal Development Kit, Unreal Engine, Unreal Gemini, Unreal Kismet, Unreal Lightmass, Unreal Matinee, Unreal PhAT, Unreal Tourament are trademarks or registered trademarks of Epic Games, Inc. in the United States of America and elsewhere.