flash-sim License
=================

This file describes the license terms for the flash-sim Python package.
The flash-sim package consists of two categories of intellectual property,
each governed by separate license terms:

  PART A — flash-sim Python Code (our original work)
  PART B — FLASH Simulation Engine and Derivative Components (third-party)

The official FLASH License Agreement (binding on all FLASH users) is
reproduced in `docs/license_agreement.txt` and is available online at
https://flash.rochester.edu. flash-sim is distributed in compliance with
that agreement; please read it before use.


======================================================================
PART A — flash-sim Python Code (Apache License 2.0)
======================================================================

The Python source code constituting the flash-sim wrapper, tooling, and
workflow automation (all .py files in the flash/, input_gen/,
output_processors/, flash_run/, scenarios/, _core/, config/, utils/,
scripts/, flash_demo/, physics/, projects/, and test/ directories, EXCEPT
where explicitly noted otherwise) is original work copyright (c) 2026
PhySimX Contributors, and is licensed under the Apache License, Version 2.0
(the "License").

You may obtain a copy of the License at:

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied. See the License for the
specific language governing permissions and limitations under the License.

The full text of the Apache License 2.0 follows at the end of this document.


======================================================================
PART B — FLASH Simulation Engine and Derivative Components
======================================================================

flash-sim is an independently developed Python interface and workflow toolkit
for the FLASH radiation-hydrodynamics simulation code. flash-sim is NOT the
FLASH code itself, and is NOT affiliated with, endorsed by, or sponsored by
the Flash Center for Computational Science.

FLASH (the simulation engine) is developed and maintained by the Flash Center
for Computational Science at the University of Rochester. The FLASH code is
governed by its own License Agreement, which ALL users must accept at:

    https://flash.rochester.edu

======================================================================
IMPORTANT — What this package does NOT include
======================================================================

This package DOES NOT include, and therefore does NOT re-distribute:

  - The FLASH source code, compiled binaries, or source tarballs
  - The FLASH SimulationMain example problems (including LaserSlab)
  - The FLASH-distributed EOS/opacity tables (e.g. *.cn4 / *.cnr / *.imx)
  - The FLASH user manual and other FLASH-distributed documentation
  - The IONMIX source code or the MultiEOS data files

None of the above may be re-distributed by individual FLASH users under
Section 3 of the FLASH License Agreement. Users of flash-sim MUST obtain
all of the above independently from the Flash Center's official website
(https://flash.rochester.edu) and accept the FLASH License Agreement
before using flash-sim with a FLASH installation.

======================================================================
Derivative Works — Modified FLASH Example Files (FLASH Agreement §4)
======================================================================

Certain scenario input files under `scenarios/`, `input_gen/*/refs/`, and
related directories are derivative works of FLASH example problem files
(e.g. `Simulation_data.F90`, `Simulation_init.F90`,
`Simulation_initBlock.F90`, `Grid_markRefineDerefine.F90`), modified by
PhySimX Contributors for new physics setups.

In compliance with Section 4 of the FLASH License Agreement:

  (a) Each such file retains a prominent header notice identifying the
      FLASH source file it derives from and stating that the file has been
      modified by PhySimX Contributors. [§4(a) — modifications declared]
  (b) This product includes software developed by and/or derived from the
      Flash Center for Computational Science
      (https://flash.rochester.edu) to which the U.S. Government retains
      certain rights. [§4(b) — acknowledgment displayed]
  (c) The FLASH Code header section describing the origins of the FLASH
      Code and its components remains intact in all modified files.
      [§4(c) — header preserved]

Users re-distributing or further modifying these derivative files must
retain the same notices and acknowledgment.

======================================================================
FLASH Center Required Attribution
======================================================================

As required by Section 4(b) of the FLASH License Agreement, any software
that includes or is derived from the FLASH Code must display the following
acknowledgement:

  "This product includes software developed by and/or derived from the
   Flash Center for Computational Science (https://flash.rochester.edu)
   to which the U.S. Government retains certain rights."

As required by the FLASH License Agreement, all publications resulting from
the use of the FLASH Code must acknowledge the Flash Center:

  "The software used in this work was developed in part by the DOE NNSA-
   and DOE Office of Science-supported Flash Center for Computational
   Science at the University of Chicago and the University of Rochester."

Users should also cite the relevant FLASH reference papers listed at:
  https://flash.rochester.edu/site/publications/flash_pubs.shtml

======================================================================
Commercial Use Warning
======================================================================

Per Section 5 of the FLASH License Agreement, commercial use of the FLASH
Code requires prior written approval from the Director of the Flash Center.
flash-sim users intending commercial use of FLASH must contact the Flash
Center directly. The Apache 2.0 license on the flash-sim Python wrapper does
NOT grant any commercial-use rights to the FLASH simulation engine.

======================================================================
flash-sim Package — PhySimX Team Attribution (Additional Terms)
======================================================================

flash-sim (the flash auxiliary Python package) is original work developed by
the PhySimX team in Mianyang, China (绵阳市), and is
copyright (c) 2026 PhySimX Contributors.

Publication Acknowledgment
--------------------------
Any publication resulting from the use of flash-sim should acknowledge the
PhySimX team (Mianyang, China) for developing this auxiliary Python
package. Suggested text:

  "We acknowledge the PhySimX team (Mianyang, China) for developing
   the flash-sim auxiliary Python package used in this work."

Commercial Use of flash-sim
---------------------------
The flash-sim Python code is released under Apache 2.0, but any commercial
use must comply with all applicable licenses, including Section 5 of the
FLASH License Agreement (commercial use of FLASH requires prior written
approval from the Director of the Flash Center). flash-sim was originally
developed by the PhySimX team (Mianyang, China); commercial licensing and
liability are governed by the applicable license and any written agreement in
force at the time. The Apache 2.0 license on the flash-sim Python wrapper
code does NOT grant any commercial-use rights to the FLASH simulation engine.

======================================================================
Third-Party Components
======================================================================

flash-sim may reference or interface with the following third-party software
(not distributed with this package):

  - FLASH 4.8 (Flash Center for Computational Science)
    License: FLASH License Agreement (https://flash.rochester.edu)
    Copyright: University of Chicago / University of Rochester

  - PARAMESH (NASA / Drexel University)
    Included within FLASH distribution

  - HDF5 (The HDF Group)
    License: BSD-style (https://www.hdfgroup.org/licenses/)

  - MPICH (Argonne National Laboratory)
    License: MPICH License (https://www.mpich.org/about/license/)

  - HYPRE (Lawrence Livermore National Laboratory)
    License: LGPL 2.1 / Apache 2.0

  - IONMIX EOS/Opacity tables
    Included in FLASH distribution; governed by FLASH License Agreement

See the NOTICE file for additional attribution details.

======================================================================
Disclaimer of Warranty and Limitation of Liability
======================================================================

THE FLASH-SIM PYTHON PACKAGE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

IN NO EVENT SHALL THE PHYSIMX CONTRIBUTORS BE LIABLE FOR ANY CLAIM, DAMAGES
OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

THE FLASH CODE IS PROVIDED "AS IS" BY THE FLASH CENTER FOR COMPUTATIONAL
SCIENCE, THE UNIVERSITY OF CHICAGO, AND THE UNIVERSITY OF ROCHESTER. SEE
THE FLASH LICENSE AGREEMENT FOR FULL DISCLAIMER TERMS.

======================================================================


                   APACHE LICENSE, VERSION 2.0
           (applies to flash-sim Python code — Part A)

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

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