|  | Home · Overviews · Examples

# Q Public License (QPL)

About the QPL license used for early versions of Qt. The X11 version of the Qt Open Source Edition is available under both the Q Public License (QPL) and the GNU General Public License. The QPL is provided only for historical reasons; we strongly encourage Free/Open Source software developers to use Qt under the GPL.

For development non-free/proprietary software, the Qt Commercial Edition is available. It has a normal commercial library license, with none of the special restrictions of the QPL or the GPL.

            THE Q PUBLIC LICENSE
            version 1.0

            Copyright (C) 1999-2008 Trolltech ASA, Norway.
            Everyone is permitted to copy and distribute this license document.

            The intent of this license is to establish freedom to share and change the
            software regulated by this license under the open source model.

            This license applies to any software containing a notice placed by the
            copyright holder saying that it may be distributed under the terms of
            the Q Public License version 1.0. Such software is herein referred to as
            the Software. This license covers modification and distribution of the
            Software, use of third-party application programs based on the Software,
            and development of free software which uses the Software.

                                             Granted Rights

            1. You are granted the non-exclusive rights set forth in this license
               provided you agree to and comply with any and all conditions in this
               license. Whole or partial distribution of the Software, or software
               items that link with the Software, in any form signifies acceptance of
               this license.

            2. You may copy and distribute the Software in unmodified form provided
               that the entire package, including - but not restricted to - copyright,
               trademark notices and disclaimers, as released by the initial developer
               of the Software, is distributed.

            3. You may make modifications to the Software and distribute your
               modifications, in a form that is separate from the Software, such as
               patches. The following restrictions apply to modifications:

                 a. Modifications must not alter or remove any copyright notices in
                    the Software.

                 b. When modifications to the Software are released under this
                    license, a non-exclusive royalty-free right is granted to the
                    initial developer of the Software to distribute your modification
                    in future versions of the Software provided such versions remain
                    available under these terms in addition to any other license(s) of
                    the initial developer.

            4. You may distribute machine-executable forms of the Software or
               machine-executable forms of modified versions of the Software, provided
               that you meet these restrictions:

                 a. You must include this license document in the distribution.

                 b. You must ensure that all recipients of the machine-executable forms
                    are also able to receive the complete machine-readable source code
                    to the distributed Software, including all modifications, without
                    any charge beyond the costs of data transfer, and place prominent
                    notices in the distribution explaining this.

                 c. You must ensure that all modifications included in the
                    machine-executable forms are available under the terms of this
                    license.

            5. You may use the original or modified versions of the Software to
               compile, link and run application programs legally developed by you
               or by others.

            6. You may develop application programs, reusable components and other
               software items that link with the original or modified versions of the
               Software. These items, when distributed, are subject to the following
               requirements:

                 a. You must ensure that all recipients of machine-executable forms of
                    these items are also able to receive and use the complete
                    machine-readable source code to the items without any charge
                    beyond the costs of data transfer.

                 b. You must explicitly license all recipients of your items to use
                    and re-distribute original and modified versions of the items in
                    both machine-executable and source code forms. The recipients must
                    be able to do so without any charges whatsoever, and they must be
                    able to re-distribute to anyone they choose.

                 c. If the items are not available to the general public, and the
                    initial developer of the Software requests a copy of the items,
                    then you must supply one.

                                        Limitations of Liability

            In no event shall the initial developers or copyright holders be liable
            for any damages whatsoever, including - but not restricted to - lost
            revenue or profits or other direct, indirect, special, incidental or
            consequential damages, even if they have been advised of the possibility
            of such damages, except to the extent invariable law, if any, provides
            otherwise.

                                              No Warranty

            The Software and this license document are provided AS IS with NO WARRANTY
            OF ANY KIND, INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS
            FOR A PARTICULAR PURPOSE.

                                             Choice of Law

            This license is governed by the Laws of Norway. Disputes shall be settled
            by Oslo City Court.