Nethack General Public License

This is a reading of the license Nethack General Public License. It covers Software. Version 2 of the model.

1. What you may do

This license permits the following.
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.
Attribution. Giving credit to the copyright holders or authors of the work, in the form the licensor asks for. It is a condition of derive.
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.
No-warranty notice. Attaching a notice that the work is provided without any warranty. It is a condition of derive.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of derive.
Source code. Providing access to the source code of the work with every copy distributed. It is a condition of derive.
Attribution. Giving credit to the copyright holders or authors of the work, in the form the licensor asks for. It is a condition of distribute.
No-warranty notice. Attaching a notice that the work is provided without any warranty. It is a condition of distribute.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of distribute.
Source code. Providing access to the source code of the work with every copy distributed. It is a condition of distribute.
Attribution. Giving credit to the copyright holders or authors of the work, in the form the licensor asks for. It is a condition of modify.
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.
No-warranty notice. Attaching a notice that the work is provided without any warranty. It is a condition of modify.
Notice. Notice: keeping the license and copyright notices with every copy. It is a condition of modify.
Source code. Providing access to the source code of the work with every copy distributed. It is a condition of modify.
Share alike. Adaptations have to be licensed under the same license or one the license names as compatible. It applies to the license as a whole.

3. What you may not do

This license prohibits the following.
Change license. Replacing the license of the work, or of an adaptation, with another license, or changing its terms.
Sublicense. Granting a third party rights in the work under a license of the licensee's own, rather than passing on the original license.

4. Further terms

The license states these terms about itself.
Validity period: Perpetual.
Region: Worldwide.
Terminates on breach: Yes.

5. Warranty, liability and support

The license carries the following clauses, quoted from the model.
Additional clauses: b) cause the whole of any work that you distribute or publish, that in whole or in part contains or is a derivative of NetHack or any part thereof, to be licensed at no charge to all third parties on terms identical to those contained in this License Agreement (except that you may choose to grant more extensive warranty protection to some or all third parties, at your option)

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