Appendix for Qt Development Framework

Version 2024-02, compliant with Qt Frame Agreement 2023-06 or later

1. This Appendix for Qt Development Framework is an integral part of the Agreement and specifies the legal terms for the licensing of Licensed Software (as defined below) between The Qt Company and the Customer. Entry into this Appendix governs the use of and supersedes any prior contracts between the Parties (including prior License Agreements and similar prior agreements), with respect to the Licensed Software under this Appendix.


2.1. Capitalized words used in this Appendix shall have the meanings described in the Agreement or as defined below. 

2.2. “Add-on Products” shall mean The Qt Company’s specific add-on software products which are not licensed as part of The Qt Company’s standard Services offerings, but shall be included into the scope of Licensed Software only if so specifically agreed between the Parties.

2.3. “Application” means software products created using the Licensed Software, which include the Redistributables, or part thereof. 

2.4. “End Customer” shall mean Customer’s customer(s) to whom Customer, directly or indirectly, distributes copies of the Redistributables as integrated or incorporated into Applications or Devices.

2.5. “Data Protection Legislation” shall mean the General Data Protection Regulation (EU 2016/679) (GDPR) and any national implementing laws, regulations and secondary legislation, as may be amended or updated from time to time, as well as any other data protection laws or regulations applicable in the relevant territory.

2.6. “Deployment Platforms” shall mean target operating systems and/or hardware specified in the License Certificate, on which the Redistributables can be distributed pursuant to the terms and conditions of this Appendix.

2.7. “Designated User(s)” shall mean the employee(s) of Customer or Customer’s Affiliates acting within the scope of their employment or Customer’s Contractors acting within the scope of their services on behalf of Customer. 

2.8. “Development License” shall mean the license needed by the Customer for each Designated User to use Licensed Software under the license grant described in Section 5 of this Appendix. Development Licenses are available per respective Licensed Software products; each product having its designated scope and purpose of use. 

2.9. “Development Platforms” shall mean the host operating system(s) specified in the License Certificate, on which Licensed Software can be used under the Development License. 

2.10. “Devices” shall mean 

  1. hardware devices or products that 
    1. are manufactured and/or distributed by the Customer, its Affiliates, Contractors or End Customer, and 
    2. incorporate, integrate or link to Applications such that substantial functionality of such unit, when used by an End User, is provided by Application(s) or otherwise depends on the Licensed Software; or 
  2. Applications designed for the hardware devices specified in item (i).

Devices covered by this Appendix shall be specified in the Pricing Appendix or Purchase Document.

2.11. “Distribution License(s)” shall mean a royalty-bearing license required for any kind of sale, trade, exchange, loan, lease, rental or other distribution by or on behalf of Customer to a third party of Redistributables in connection with Devices pursuant to license grant described in Section 5.3 of this Appendix. Distribution Licenses are sold separately for each type of Device respectively and cannot be used for any other type of Devices. 

2.12. “Distribution License Packs” shall mean set of prepaid Distribution Licenses for distribution of Redistributables, as defined in The Qt Company’s standard price list, quote, Pricing Appendix or in the Purchase Document, as applicable.  

2.13. “Evaluation License Term” shall mean a time period specified in the License Certificate for the Customer to use the relevant Licensed Software for evaluation purposes according to Section 5.5 of this Appendix.

2.14. “Intellectual Property Rights” shall mean patents (including utility models), design patents, and designs (whether or not capable of registration), chip topography rights and other like protection, copyrights, trademarks, service marks, trade names, logos or other words or symbols and any other form of statutory protection of any kind and applications for any of the foregoing as well as any trade secrets. 

2.15. “License Certificate” shall mean a certificate generated by The Qt Company for each Designated User respectively upon their download of the Licensed Software, which will be available under the respective Designated User’s Qt Account at License Certificates will specify relevant information pertaining to the Licensed Software purchased by Customer and the license to the Licensed Software. 

2.16. “License Fee” shall mean the fee charged to Customer for rights granted under this Appendix.  

2.17. “Licensed Software” shall mean the specified product(s) of Qt Software which Customer has purchased and which is provided to Customer under the terms of this Appendix (including its Exhibits). Licensed Software shall include corresponding online or electronic documentation, associated media and printed materials, including source code (where applicable), example programs and the documentation. Licensed Software does not include Third Party Software (as defined in Section 6) or Qt Community Edition. The Qt Company may, in the course of its development activities, at its free and absolute discretion and without any obligation to send or publish any notifications to Customer or in general, make changes, additions or deletions in the components and functionalities of the Licensed Software, provided that no such changes, additions or deletions will affect the already released version of the Licensed Software, but only upcoming version(s).  

2.18. “License Term” shall mean the agreed validity period of the Development License during which the relevant Licensed Software product can be used pursuant to this Appendix. The agreed License Term, as ordered and paid for by Customer, shall be memorialized in the applicable License Certificate. 

2.19. “Customer’s Records” shall mean books and records that contain information bearing on Customer’s compliance with the Agreement, Customer’s use of Qt Community Edition and/or the payments due to The Qt Company under the Agreement, including, but not limited to user information, assembly logs, sales records and distribution records. 

2.20. “Modified Software” shall have the meaning as set forth below in Section 4. 

2.21. “Qt Software” shall mean the development and design software of The Qt Company, which The Qt Company makes available under commercial and/or open source licenses as either the “Licensed Software” or the “Qt Community Edition”.

2.22. “Permitted Software” shall mean third party products that are generally available to the public, which may include parts of Qt Community Edition or be developed using Qt Community Edition. 

2.23. “Pre-Release Code” shall have the meaning as set forth in Section 7.

2.24. “Prohibited Combination” shall mean any effort to use, combine, incorporate, link or integrate Licensed Software with any software created with or incorporating Qt Community Edition, or use Licensed Software for creation of any such software.

2.25. “Qt Community Edition” shall mean  the open source version of Qt Software available under the terms of the GNU Lesser General Public License, version 2.1 or later (“LGPL”) or the GNU General Public License, version 2.0 or later (“GPL”). For clarity, Qt Community Edition shall not be provided, governed or used under this Appendix.

2.26. “Redistributables" shall mean the portions of Licensed Software as set forth in Exhibit 1 hereto that may be distributed pursuant to this Appendix in object code form only, including any relevant documentation. Where relevant, any reference to Licensed Software in this Appendix includes and refers to Redistributables.

2.27. “Renewal Term” shall mean an extension of the previous License Term as agreed between the Parties.

2.28. “Submitted Modified Software” shall have the meaning as set forth in Section 4.2 of this Appendix.

2.29. “Third-Party Software" shall have the meaning set forth in Section 6 of this Appendix.

2.30. “Updates” shall mean a release or version of the Licensed Software containing bug fixes, error corrections and other changes that are generally made available to users of the Licensed Software that have contracted for Support. Updates are generally depicted as a change to the digits following the decimal in the Licensed Software version number. The Qt Company shall make Updates available to Customer under the Support. Updates shall be considered as part of the Licensed Software hereunder.

2.31. “Upgrades” shall mean a release or version of the Licensed Software containing enhancements and new features and are generally depicted as a change to the first digit of the Licensed Software version number. In the event that Upgrades are provided to Customer under this Appendix, they shall be considered as part of the Licensed Software hereunder.


3.1. Ownership of The Qt Company

3.1.1. The Licensed Software is protected by copyright laws and international copyright treaties, as well as other intellectual property laws and treaties. The Licensed Software is licensed, not sold.

3.1.2. All of The Qt Company's Intellectual Property Rights are and shall remain the exclusive property of The Qt Company or its respective licensors . No rights to The Qt Company’s Intellectual Property Rights are assigned or granted to Customer under this Appendix, except when and to the extent expressly specified herein.

3.2. Ownership of Customer

3.2.1. All of Customer’s Intellectual Property Rights are and shall remain the exclusive property of Customer or its licensors respectively.

3.2.2. Except to the extent set forth in this Appendix, all Intellectual Property Rights to the Modified Software, Applications and Devices (except to Redistributables included therein) shall remain with Customer. 


4.1. Customer may create bug-fixes, error corrections, patches or modifications to the Licensed Software (“Modified Software”). To the extent that Customer’s Modified Software breaks source or binary compatibility or other functionality with the Licensed Software, Customer acknowledges that The Qt Company’s ability to provide Support may be prevented or limited and Customer’s ability to make use of Updates may be restricted.

4.2. Customer may, at its sole and absolute discretion, choose to submit Modified Software to The Qt Company (“Submitted Modified Software”) in connection with Customer’s Support request, service request or otherwise. In the event Customer does so, then, Customer hereby grants The Qt Company a sublicensable, assignable, irrevocable, perpetual, worldwide, non-exclusive, royalty-free and fully paid-up license, under all of Customer’s Intellectual Property Rights, to reproduce, adapt, translate, modify, and prepare derivative works of, publicly display, publicly perform, sublicense, make available and distribute such Submitted Modified Software as The Qt Company sees fit at its free and absolute discretion.


5.1. Development with Licensed Software

5.1.1. Subject to the terms of the Agreement, The Qt Company grants to Customer a worldwide, non-exclusive, non-transferable license, valid for each License Term, to use, modify and copy the Licensed Software by Designated Users on the Development Platforms for the sole purposes of designing, developing, demonstrating and testing Application(s) and/or Devices, and to provide support and other services related to such Applications and Devices to End Customers. Each Application and/or Device can only include, incorporate or integrate contributions by such Designated Users who are duly licensed for the applicable Development Platform(s) and Deployment Platform(s) (i.e have a valid license for the appropriate Licensed Software product and only use one type of Qt Development License per Customer Application and/or Device(s)).

5.1.2. Customer may install copies of the Licensed Software on five (5) computers per Designated User, provided that only Designated Users who have a valid Development License may use the Licensed Software. 

5.1.3. Customer may designate another Designated User to replace a then-current Designated User by notifying The Qt Company in writing, where such replacement is due to termination of employment, long-term absence or other permanent reason affecting Designated User’s need for Licensed Software.  

5.1.4. Upon expiry of the initially agreed License Term, the respective License Term shall be automatically extended by one or more Renewal Term(s), unless and until either Party notifies the other Party in writing, that it does not wish to continue the License Term, such notification to be provided to the other Party no less than thirty (30) days before expiry of the respective License Term. The Qt Company shall, in good time before the due date for the above notification, remind the Customer on the coming Renewal Term. Unless otherwise agreed between the Parties, Renewal Term shall be equal to the length of the previous License Term, but no longer than thirty-six (36) months.

5.1.5. Any such Renewal Term shall be subject to License Fees agreed between the Parties or, if no advance agreement exists, subject to The Qt Company’s standard list pricing applicable at the commencement date of any such Renewal Term.

5.2. Distribution of Applications 

5.2.1. Subject to the terms of the Agreement, The Qt Company grants to Customer a worldwide, non-exclusive, non-transferable, perpetual, royalty-free and revocable (only for Customer’s material breach of agreement) right and license to:

  1. distribute, by itself or through its Contractors, Redistributables as installed, incorporated or integrated into Applications for execution on the Deployment Platforms; and
  2. grant perpetual and irrevocable sublicenses to Redistributables, as distributed hereunder, for End Customers solely to the extent necessary in order for the End Customers to use the Applications for their respective intended purposes.

5.2.2. Right to distribute the Redistributables as part of an Application as provided herein is not royalty-bearing but is conditional upon the Application having been created, updated and maintained under a valid and duly paid Development License.

5.3. Distribution of Devices 

5.3.1. Subject to the terms of the Agreement, The Qt Company grants to Customer a worldwide, non-exclusive, non-transferable, perpetual, revocable (only for Customer’s material breach of agreement), royalty-bearing right and license to:

  1. distribute, by itself or through one or more tiers of Contractors, Redistributables as installed, incorporated or integrated, or intended to be installed, incorporated or integrated into Devices for execution on the Deployment Platforms; and
  2. grant perpetual and irrevocable sublicenses to Redistributables, as distributed hereunder, for End Customers solely to the extent necessary in order for the End Customers to use the Devices for their respective intended purposes.

5.3.2. Right to distribute the Devices as provided herein is conditional upon (i) the Devices having been created, updated and maintained under a valid and duly paid Development License, and (ii) Customer having acquired corresponding Distribution Licenses at the time of distribution of any Devices to End Customers. 

5.4. Further Requirements

5.4.1. The licenses granted in this Section 5 by The Qt Company to Customer are conditional and subject to Customer's compliance with the following terms:

  1. Customer acknowledges that The Qt Company has separate products for the purpose of Applications and Devices respectively, where development and distribution of Devices is only allowed using the correct designated product. Customer shall ensure and bear the burden of proof that Customer is using a correct product entitling Customer to development and distribution of Devices;  
  2. Customer shall not remove or alter any copyright, trademark or other proprietary rights notice(s) contained in any portion of the Licensed Software;  
  3. Applications must add primary and substantial functionality to Licensed Software so as not to compete with the Licensed Software; 
  4. Applications may not pass on functionality which in any way makes it possible for others to create software with Licensed Software; provided however that Customer may use Licensed Software’s scripting and QML ("Qt Quick") functionality solely in order to enable scripting, themes and styles that augment the functionality and appearance of the Application(s) without adding primary and substantial functionality to the Application(s); 
  5. Customer shall not use Licensed Software in any manner or for any purpose that infringes, misappropriates or otherwise violates any Intellectual Property Right or right of any third party, or that violates any applicable law; 
  6. Customer shall not use The Qt Company's or any of its suppliers' names, logos, or trademarks to market Applications, except that Customer may use “Built with Qt” logo to indicate that an Application or Device was developed using Licensed Software;   
  7. Customer shall not distribute, sublicense or disclose source code of Licensed Software to any third party (provided however that Customer may appoint employee(s) of Contractors and Affiliates as Designated Users to use Licensed Software pursuant to this Appendix). 
  8. Customer shall not grant the End Customers a right to: (a) make copies of the Redistributables except when and to the extent required to use the Applications and/or Devices for their intended purpose; (b) modify the Redistributables or create derivative works thereof; (c) decompile, disassemble or otherwise reverse engineer Redistributables; or (d) redistribute any copy or portion of the Redistributables to any third party, except as part of the onward sale of the Application or Device on which the Redistributables are installed;
  9. Customer shall not, and shall cause that its Affiliates or Contractors shall not, use Licensed Software in any Prohibited Combination, unless Customer has received specific advance written permission from The Qt Company to do so. Absent such written permission, any and all distribution by Customer during the term of the Agreement of a hardware device or product: a) which incorporates or integrates any part of Licensed Software or Qt Community Edition; or b) where substantial functionality is provided by software built with Licensed Software or Qt Community Edition or otherwise depends on Licensed Software or Qt Community Edition, shall be considered to be Device distribution under this Appendix and shall be dependent on Customer’s compliance thereof (including but not limited to the obligation to pay applicable License Fees for such distribution). Notwithstanding the foregoing, Customer is entitled to use and combine Licensed Software with Permitted Software; 
  10. Customer shall cause all of its Affiliates, Contractors and End Customer entitled to make use of the licenses granted under this Appendix, to be contractually bound to comply with the relevant terms hereof and not to use the Licensed Software beyond the terms hereof nor for any purposes other than operating within the scope of their services for Customer. Customer shall be responsible for any and all actions and omissions of its Affiliates, Contractors, and End Customers relating to the Licensed Software and use thereof (including but not limited to payment of all applicable License Fees); 
  11.  Except when and to the extent explicitly provided in this Section 5, Customer shall not transfer, publish, disclose, display or otherwise make available the Licensed Software; and
  12. Customer shall not attempt or enlist a third party to conduct or attempt to conduct any of the above.

5.4.2. The above terms shall not be applicable if and solely to the extent they conflict with any mandatory provisions of applicable laws.

5.4.3. Any use of Licensed Software beyond the provisions of this Appendix is strictly prohibited and requires, at a minimum an additional license from The Qt Company (e.g. certain additional rights granted under software development kit “SDK” agreement with regard to limitations of Section 5.4.1 iv, vii or viii).

5.5. Evaluation License

5.5.1. Subject to the terms of this Appendix, The Qt Company grants to Customer a worldwide, non-exclusive, non-transferable license, valid for the Evaluation License Term to use the relevant Licensed Software product solely for Customer’s internal use to evaluate and determine whether the Licensed Software meets Customer's business requirements, specifically excluding any commercial use of the Licensed Software or any derived work thereof. 

5.5.2. Upon the expiry of the Evaluation License Term, Customer must either discontinue use of the relevant Licensed Software or acquire a commercial Development License specified herein.

6. THIRD-PARTY SOFTWARE. The Licensed Software may provide links or access to third party libraries or code (collectively "Third-Party Software") to implement various functions. Third-Party Software does not, however, comprise part of the Licensed Software, but is provided to Customer complimentary and use thereof is discretionary for Customer. Third-Party Software will be listed in the ".../src/3rdparty" source tree delivered with the Licensed Software or documented in the Licensed Software, as such may be amended from time to time. Customer acknowledges that use or distribution of Third-Party Software is in all respects subject to applicable license terms of applicable third-party right holders.


7.1. The Licensed Software may contain pre-release code and functionality, or sample code marked or otherwise stated with appropriate designation such as “Technology Preview”, “Alpha”, “Beta”, “Experimental”, “Sample”, “Example” etc. (“Pre-Release Code”). 

7.2. Such Pre-Release Code may be provided complimentary for  Customer, in order to provide experimental support or information for new platforms or preliminary versions of one or more new functionalities, or for other similar reasons. Pre-Release Code may not be at the level of performance and compatibility of a final, generally available, product offering.  Pre-Release Code may not operate correctly, may contain errors and may be substantially modified by The Qt Company prior to a commercial product release, if any. The Qt Company is under no obligation to make Pre-Release Code commercially available, or provide any Support or Updates relating thereto. To the maximum extent permitted by law, the Qt Company assumes no liability whatsoever regarding any Pre-Release Code and any use thereof is exclusively at Customer’s own risk and expense.

7.3.  Unless Licensed Software specifies different license terms for the respective Pre-Release Code, Customer is entitled to use such pre-release code pursuant to Section 5 of this Appendix, just like other Licensed Software.

8. SUPPORT. Support is provided according to agreed support level and subject to applicable requirements and restrictions, as specified in the Appendix for Support Terms.


9.1. Distribution License Packs

9.1.1. Unless otherwise agreed in writing, Distribution Licenses shall be purchased by way of Distribution License Packs.

9.1.2. Upon due payment of the ordered Distribution License Pack(s), Customer will have an account of Distribution Licenses available for distributing the Redistributables in accordance with this Agreement.

9.2. Each time Customer distributes a copy of Redistributables, one Distribution License is used and Customer’s account of available Distribution Licenses is decreased accordingly.

9.3. Customer may distribute copies of the Redistributables so long as Customer has Distribution Licenses remaining on its account. 


10.1. Customer’s Record-keeping

10.1.1. Customer shall at all times during the term of the Agreement or validity of any of the licenses hereunder, whichever is later, and for a period of two (2) years thereafter, maintain Customer’s Records in an accurate and up-to-date form. Customer’s Records shall be adequate to reasonably enable The Qt Company to determine Customer’s compliance with the provisions of the Agreement. The records shall conform to general good accounting practices.  

10.1.2. Customer shall, within thirty (30) days from receiving The Qt Company’s request to that effect, deliver to The Qt Company a report based on Customer’s Records, such report to contain information, in sufficient detail, on: (i) number and identity of users working with Licensed Software or Qt Community Edition, (ii) copies of Redistributables distributed by Customer during the most recent calendar quarter and/or any other term specified by The Qt Company, and (iii) any other information pertaining to Customer’s compliance with the terms of the Agreement (e.g. information on products and/or projects relating to use of Distribution Licenses), as The Qt Company may reasonably require from time to time.

10.2. The Qt Company’s Audit Rights

10.2.1. The Qt Company or an independent auditor acting on behalf of The Qt Company may, upon at least thirty (30) days’ prior written notice and at The Qt Company expense, audit Customer with respect to Customer’s use of the Licensed Software, but not more frequently than once during each six (6) month period. Such audit may be conducted by mail, electronic means or through an in-person visit to Customer’s place of business. Any possible in-person audit shall be conducted during regular business hours at Customer's facilities, shall not unreasonably interfere with Customer's business activities and shall be limited in scope to verify Customer’s compliance with the terms of the Agreement. The Qt Company or its independent auditor shall be entitled to inspect Customer’s Records and conduct necessary interviews of Customer’s relevant employees and Contractors. All Customer’s Records and use thereof shall be subject to the obligation of confidentiality under the Agreement. 

10.2.2. If an audit reveals that Customer is using the Licensed Software beyond scope of the licenses Customer has paid for, Customer shall pay to The Qt Company any amounts owed for such unauthorized use within thirty (30) days from receipt of the corresponding invoice from The Qt Company.  
10.2.3. In addition, in the event the audit reveals a material violation of the terms of the Agreement (without limitation, either (i) underpayment of more than 10% of License Fees or 10,000 euros (whichever is more) or (ii) distribution of products, which include or result from Prohibited Combination, shall be deemed a material violation for purposes of this section), then Customer shall pay The Qt Company's reasonable cost of conducting such audit. 


11.1. Termination of Licenses

11.1.1. The Qt Company may terminate Customer’s rights to any and all Licensed Software (including access to Support), if Customer:

  1. commits a material breach of the Agreement (including this Appendix) and has not remedied the breach within a reasonable period of time (which shall be no less than 30 days) of The Qt Company’s written notice specifying the breach, or
  2. becomes bankrupt, insolvent or goes into liquidation or debt restructuring.

11.2. Suspension of rights: Instead of termination, The Qt Company reserves the right to suspend or withhold grants of any and all rights to the Licensed Software (including Support), should Customer fail to make payment in timely fashion or otherwise violate or is reasonably suspected of violating its obligations under the Agreement and/or this Appendix, and where such violation or breach is not cured within ten (10) business days following The Qt Company’s written notice thereof. 

11.3. Parties´ Rights and Duties upon Termination

11.3.1. Upon expiry or termination of the Development Licenses, Customer shall cease and shall cause all Designated Users (including those of its Affiliates’ and Contractors’) to cease using the relevant Licensed Software.

11.3.2. Upon such expiry or termination of Development Licenses, Customer shall destroy or return to The Qt Company all copies of the respective Licensed Software and all related materials and will certify the same by Customer’s duly authorized officer to The Qt Company upon its request, provided however that Customer may retain and utilize such copies of the Licensed Software to the extent required to provide Customer’s continued support to End Customers,  for archiving purposes or as is required under applicable law.

11.3.3. Distribution Licenses are perpetual and, therefore, Customer’s distribution rights hereunder shall only terminate upon The Qt Company’s termination of Distribution Licenses due to Customer’s material breach as set forth in Section 11.1.1(i) of this Appendix. In case of such termination by The Qt Company due to Customer’s material breach, Customer must cease any distribution of Applications and Devices at the effective date of termination.

11.3.4. Expiry or termination of any of Customer’s licenses hereunder for any reason whatsoever shall not: 

  1. relieve Customer of its obligation to pay any License Fees accrued or payable to The Qt Company prior to the effective date of termination, and Customer pay to The Qt Company all such fees within 30 days from the effective date of termination of the licenses; 
  2. relieve Customer of its obligation to ensure that Applications and Devices (including those already distributed) remain in compliance with the terms of the Agreement; nor
  3. affect any rights of End Customer to continue use of Applications and Devices (and therein incorporated Redistributables).

11.4. Extension of Rights under Special Circumstances. In the event that, during the applicable License Term, The Qt Company is declared bankrupt under a final, non-cancellable decision by relevant court of law, and the Agreement is not, at the date of expiry of the Development License(s), assigned to a party who has assumed The Qt Company’s position as a legitimate licensor of Licensed Software under the Agreement, then all valid Development Licenses possessed by Customer at such date of expiry, and which Customer has not notified for expiry, shall be extended to be valid in perpetuity under the terms of the Agreement. Any such extension shall not apply to The Qt Company’s Support obligations.