libpng License

This is a reading of the license libpng License. It covers Software. Version 2 of the model.

1. What you may do

This license permits the following.
Change license. Replacing the license of the work, or of an adaptation, with another license, or changing its terms.
Charge distribution fee. Charging a fee for the act of providing a copy of the work to someone else.
Commercial use. Using the work to generate income, directly or indirectly, for example by selling it or by using it in advertising.
Derivative works. Distributing an adaptation of the work and making it available to the public.
Derive. Creating a new work from the work, such as a translation, adaptation or arrangement of it or of a part of it.
Display. Showing the work to the public without making a copy the viewer keeps.
Distribute. Providing copies of the work to the public or to anyone else.
Modified works. Distributing a modified version of the work that does not amount to a new, derivative work.
Modify. Altering the work, for example by updating it, without creating a new work; an alteration that creates a new work is Derive.
Present. Performing the work in public, including by broadcast or other communication to the public.
Reproduce. Making copies of the work in any form.

2. What you must do

These conditions come with the permissions above.
Use a compliant license. Choosing a replacement license that stays compliant with the terms of the original license. It is a condition of change license.
Modification notice. Marking a changed work as changed, saying how it differs from the original and keeping earlier notices of change. It is a condition of derive.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of derive.
Rename. Giving a modified or derived work a name that tells it apart from the original. It is a condition of derive.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of distribute.
Modification notice. Marking a changed work as changed, saying how it differs from the original and keeping earlier notices of change. It is a condition of modify.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of modify.
Rename. Giving a modified or derived work a name that tells it apart from the original. It is a condition of modify.

3. Further terms

The license states these terms about itself.
Validity period: Perpetual.
Region: Worldwide.

4. Warranty, liability and support

The license carries the following clauses, quoted from the model.
Warranty disclaimer: The PNG Reference Library is supplied "AS IS". The Contributing Authors and Group 42, Inc. disclaim all warranties, expressed or implied, including, without limitation, the warranties of merchantability and of fitness for any purpose.
Limitation of liability: The Contributing Authors and Group 42, Inc. assume no liability for direct, indirect, incidental, special, exemplary, or consequential damages, which may result from the use of the PNG Reference Library, even if advised of the possibility of such damage.
Additional clauses: There is no warranty against interference with your enjoyment of the library or against infringement. There is no warranty that our efforts or the library will fulfill any of your particular purposes or needs. This library is provided with all faults, and the entire risk of satisfactory quality, performance, accuracy, and effort is with the user.

This text was generated from the machine readable model of the license. It is not legal advice, and only the license itself is binding.