The Qt Company Ltd and its subsidiaries (“The Qt Company”) is the owner of Qt trademarks worldwide. The Qt trademarks are valuable assets which The Qt Company wishes to protect. Trademarks are used to provide assurance to the public of the quality of the products and services with which the trade mark is associated. As such, they must be used properly and consistently otherwise the trademarks risk becoming generic, making them impossible to enforce. The following guidelines govern use of the Qt trademarks, whether by The Qt Company or third parties, in order to protect the value of the Qt trademarks and provide guidance to Qt users on how they should and should not use the Qt trademarks. Unauthorized use of the Qt trademarks, or confusingly similar marks, which does not comply with these guidelines is prohibited and may constitute trademark infringement. These guidelines do not interfere with your right to use or modify the underlying Qt open source software as permitted under applicable open source license.
In certain circumstances, when marks are used for the purpose of description or identification, use of the mark constitutes “fair use” as it does not suggest sponsorship or endorsement by the trademark owner and therefore is not being used in a manner to confuse the user. Such use is permitted, would not constitute trademark infringement and does not therefore require a trademark license. The purpose of this section of the guidelines is to set out what constitutes “fair use” of the Qt marks. However, if in doubt as to whether your proposed use of the Qt marks would constitute “fair use”, please contact The Qt Company General Counsel Mika Pälsi.
Use of the Qt word mark and / or the Qt logo to make factual statements about Qt software products or the Qt Project, or to truthfully state that your products or services are created using Qt software, designed for use with Qt products or compatible with Qt products would constitute “fair use”, for example:
1.1 To specifically refer to Qt products using the Qt word mark, e.g. Qt is an application service framework software.
1.2 To refer to an application created with Qt using the Qt word mark where the Qt name is not being used in a way which suggests sponsorship or endorsement of the product, e.g. XYZ application includes dependencies to Qt version 4.7.2, or XYZ application created using Qt version 4.7.2.
1.3 To show the visually unmodified “Built with Qt” logo in conjunction with an application or a device that it created with Qt, noting what is stated in the Qt brand guidelines
1.4 To show the visually unmodified Qt logo in conjunction with electronic marketing material of a product created with Qt, noting what is stated in the Qt brand guidelines
1.5 To refer to Qt ports that are part of the Qt Project using the Qt word mark e.g. Qt for Windows®, Qt for Mac OSX®, Qt for Embedded Linux®, Qt for Android® etc.
1.6 To refer to tools created for use with Qt using the Qt word mark e.g. ABC Tool for Qt. If the tool is only capable of being used with a specific version of Qt, then the version number should be stated, e.g. ABC Tool for Qt versions 4.8.0 or later.
1.7 In articles about the Qt software or Qt Project or other Qt products using the Qt word mark or the visually unmodified Qt logo, noting what is stated in the Qt brand guidelines.
The “fair use” in conjunction with applications or devices as defined in clauses 1.2 and 1.3, and tools as defined in clause 1.6 is allowed for users of both open-source and commercially licensed Qt. Any other uses of the Qt wordmark and / or the Qt logo require The Qt Company’s approval and may require a license from The Qt Company.
Without limitation, the following uses of the Qt trademarks are not permitted:
2.1 Use of the Qt logo, Qt word mark or Qt slogan in any other way than what is allowed under the “Fair Use” provisions described above, without an express written license.
2.2 Use of the Qt trademarks in a manner that is false, misleading or would disparage, denigrate or otherwise be detrimental to the Qt trademarks, the reputation of the Qt Project, The Qt Company or its products or services, e.g. through false or misleading advertising.
2.3 Use of the Qt trademark in conjunction with your company name or another name without express written permission.
2.4 Use of the Qt trademarks as the whole or part of your domain names.
2.5 Use of the Qt trademarks as meta tags.
2.6 Use of the Qt trademarks as part of your company name or logo.
2.7 Use of the Qt trademarks in a manner that suggests endorsement or sponsorship of your products or services, e.g. by more prominent use of the Qt trademarks than your own marks or company name.
2.8 Use of the Qt trademarks on the cover of a book or publication without an express written license.
2.9 Use of the Qt trademarks on printed promotional or marketing materials such as posters, brochures, signs to promote your events, products or services without express written permission.
2.10 Alterations of the Qt trademarks in any way.
2.11 Attempts to assert any ownership rights in the Qt trademarks, including but not limited to attempts to register Qt trademarks or confusingly similar as trademarks, company names, domain names anywhere in the world.
Use of the Qt trademarks, either under the “Fair Use” provisions described above or under a separate trademark license agreement, must comply with the Qt brand guidelines.
The following rules are applied to all usage of Qt trademarks, whether within the “fair use” guidelines as set out above or under a license:
No Possessives: Since a trademark is not a noun, it must never be used in possessive form, e.g. one should not refer to “Qt’s software” but rather to “Qt® software”.
No Plurals: Since a trademark is not a noun, it must never be used in plural form.
No Verbs: Since a trademark is not a verb, it must never be used as a verb.
Distinguish the Qt trademark: from surrounding words by capitalizing the first letter, underlining, italicizing, placing in bold or different font, and/or placing in quotes.
Never use the Qt trademark with both letters capitalized, in the form “QT”.
Proper Trademark Attribution: Users of the Qt word mark must include an attribution that Qt is a registered mark e.g. by using ® after the Qt trademark in subscript or superscript, and with a trademark legend denoting that Qt is a registered trademark of The Qt Company Ltd. and its subsidiaries.
The ® symbol is required upon the first use of the mark in any text, even though the symbol may have already been used in the headline or other prominent use. It is not necessary to repeat the designation throughout the rest of the document. However, the symbol should be used on first occurrence within sidebars, charts, tables, graphs, and slides, since these elements have greater potential to be read or placed independently.
The trademark legend need not be prominently displayed or included on physical product packaging, and may be included in the product documentation or at the bottom of a web page. The legend must be presented in text size and font large enough to be legible.
The following is an example of the legend to be used in all material referencing the Qt trademark:
“Qt is a registered trademark of The Qt Company Ltd. and its subsidiaries.” If the material referencing the Qt trademark also refers to a number of other third party trademarks, a general ownership statement e.g. “all other trademarks are the property of their respective owners” is acceptable.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE QT COMPANY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO QT TRADEMARKS.
IN PARTICULAR, NOTHING HEREIN SHALL BE CONSTRUED AS A REPRESENTATION, WARRANTY OR PROMISE BY THE QT COMPANY THAT THE USE OF THE QT TRADEMARKS WILL NOT INFRINGE THE INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY.
ALL USE OF AND RELIANCE ON THE LICENSED SOFTWARE IS AT THE SOLE RISK OF AND RESPONSIBILITY OF THE PARTY USING THE QT TRADEMARKS UNDER THESE GUIDELINES, WITHOUT AN EXPRESS LICENSE AGREEMENT.
If you have any questions regarding these guidelines, wish to report any misuse of the Qt trademarks, are unsure whether you require a trademark license or wish to obtain a license to use the Qt trademarks, please contact The Qt Company General Counsel Mika Pälsi.
The Qt Company reserves the right to update or amend these guidelines at its discretion at any time with 30 days’ written notice by posting the updated or amended terms on the Qt web site.