LICENSE_CC BY 4.0

Copyright (c) 2026 Hiroshi Harada

This work is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).

You are free to:
- Share: Copy and redistribute the material in any medium or format.
- Adapt: Remix, transform, and build upon the material for any purpose, even commercially.

Under the following terms:
- Attribution: You must give appropriate credit, provide a link to the license, 
  and indicate if changes were made.

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Creative Commons Attribution 4.0 International Public License
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By exercising the Licensed Rights (defined below), You accept and agree to be
bound by the terms and conditions of this Creative Commons Attribution 4.0
International Public License ("Public License"). To the extent this Public
License may be interpreted as a contract, You are granted the Licensed Rights
in consideration of Your acceptance of these terms and conditions, and the
Licensor grants You such rights in consideration of benefits the Licensor
receives from making the Licensed Material available under these terms and
conditions.

Section 1 – Definitions.

a. Adapted Material means material subject to Copyright and Similar Rights
   that is derived from or based upon the Licensed Material and in which the
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   otherwise modified in a manner requiring permission under the Copyright
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b. Adapter's License means the license You apply to Your Copyright and
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   with the terms and conditions of this Public License.

c. Copyright and Similar Rights means copyright and/or similar rights closely
   related to copyright including, without limitation, performance, broadcast,
   sound recording, and Sui Generis Database Rights, without regard to how
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   the rights specified in Section 2(b)(1)-(2) are not Copyright and Similar
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d. Effective Technological Measures means those measures that, in the absence
   of proper authority, may not be circumvented under laws fulfilling
   obligations under Article 11 of the WIPO Copyright Treaty adopted on
   December 20, 1996, and/or similar international agreements.

e. Exceptions and Limitations means fair use, fair dealing, and/or any other
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f. Licensed Material means the artistic or literary work, database, or other
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g. Licensed Rights means the rights granted to You subject to the terms and
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   the Licensor has authority to license.

h. Licensor means the individual(s) or entity(ies) granting rights under this
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i. Share means to provide material to the public by any means or process that
   requires permission under the Licensed Rights, such as reproduction,
   public display, public performance, distribution, dissemination,
   communication, or importation, and to make material available to the
   public including in ways that members of the public may access the
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j. Sui Generis Database Rights means rights other than copyright resulting
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k. You means the individual or entity exercising the Licensed Rights under
   this Public License. Your has a corresponding meaning.

Section 2 – Scope.

a. License grant.

   1. Subject to the terms and conditions of this Public License, the
      Licensor hereby grants You a worldwide, royalty-free, non-sublicensable,
      non-exclusive, irrevocable license to exercise the Licensed Rights in
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         A. reproduce and Share the Licensed Material, in whole or in part; and

         B. produce, reproduce, and Share Adapted Material.

   2. Exceptions and Limitations. For the avoidance of doubt, where Exceptions
      and Limitations apply to Your use, this Public License does not apply,
      and You do not need to comply with its terms and conditions.

   3. Term. The term of this Public License is specified in Section 6(a).

   4. Media and formats; technical modifications allowed. The Licensor
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      whether now known or hereafter created, and to make technical
      modifications necessary to do so. The Licensor waives and/or agrees not
      to assert any right or authority to forbid You from making technical
      modifications necessary to exercise the Licensed Rights, including
      technical modifications necessary to circumvent Effective Technological
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   5. Downstream recipients.

      A. Offer from the Licensor – Licensed Material. Every recipient of the
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         to exercise the Licensed Rights under the terms and conditions of
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      B. No downstream restrictions. You may not offer or impose any
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         so restricts exercise of the Licensed Rights by any recipient of the
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   6. No endorsement. Nothing in this Public License constitutes or may be
      construed as permission to assert or imply that You are, or that Your
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Section 3 – License Conditions.

Your exercise of the Licensed Rights is expressly made subject to the
following conditions.

a. Attribution.

   1. If You Share the Licensed Material (including in modified form), You
      must:

         A. retain the following if it is supplied by the Licensor with the
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             i. identification of the creator(s) of the Licensed Material and
                any others designated to receive attribution, in any reasonable
                manner requested by the Licensor;

             ii. a copyright notice;

             iii. a notice that refers to this Public License;

             iv. a notice that refers to the disclaimer of warranties;

             v. a URI or hyperlink to the Licensed Material to the extent
                reasonably practicable;

         B. indicate if You modified the Licensed Material and retain an
            indication of any previous modifications; and

         C. indicate the Licensed Material is licensed under this Public
            License, and include the text of, or the URI or hyperlink to, this
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   2. You may satisfy the conditions in Section 3(a)(1) in any reasonable
      manner based on the medium, means, and context in which You Share the
      Licensed Material. For example, it may be reasonable to satisfy the
      conditions by providing a URI or hyperlink to a resource that includes
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   3. If requested by the Licensor, You must remove any of the information
      required by Section 3(a)(1)(A) to the extent reasonably practicable.

Section 4 – Sui Generis Database Rights.

Where the Licensed Rights include Sui Generis Database Rights that apply to
Your use of the Licensed Material:

a. for the avoidance of doubt, Section 2(a)(1) grants You the right to extract,
   reuse, reproduce, and Share all or a substantial portion of the contents of
   the database;

b. if You include all or a substantial portion of the database contents in a
   database in which You have Sui Generis Database Rights, then the database
   in which You have Sui Generis Database Rights (but not its individual
   contents) is Adapted Material; and

c. You must comply with the conditions in Section 3(a) if You Share all or a
   substantial portion of the contents of the database.

Section 5 – Disclaimer of Warranties and Limitation of Liability.

a. Unless otherwise separately undertaken by the Licensor, to the extent
   possible, the Licensor offers the Licensed Material as-is and as-available,
   and makes no representations or warranties of any kind concerning the
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   defects, accuracy, or the presence or absence of errors, whether or not
   known or discoverable. Where disclaimers of warranties are not allowed in
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b. To the extent possible, in no event will the Licensor be liable to You on
   any legal theory (including, without limitation, negligence) or otherwise
   for any direct, special, indirect, incidental, consequential, punitive,
   exemplary, or other losses, costs, expenses, or damages arising out of this
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   been advised of the possibility of such losses, costs, expenses, or
   damages. Where a limitation of liability is not allowed in full or in part,
   this limitation may not apply to You.

Section 6 – Term and Termination.

a. This Public License applies for the term of the Copyright and Similar
   Rights licensed here. However, if You fail to comply with this Public
   License, then Your rights under this Public License terminate automatically.

b. Where Your right to use the Licensed Material has terminated under Section
   6(a), it reinstates:

   1. automatically as of the date the violation is cured, provided it is
       cured within 30 days of Your discovery of the violation; or

   2. upon express reinstatement by the Licensor.

c. For the avoidance of doubt, this Section 6 does not affect any right the
   Licensor may have to seek remedies for Your violations of this Public
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d. For the avoidance of doubt, the Licensor may also offer the Licensed
   Material under separate terms or conditions or stop distributing the
   Licensed Material at any time; however, doing so will not terminate this
   Public License.

Section 7 – Other Terms and Conditions.

The Licensor shall not be bound by any additional or different terms or
conditions communicated by You unless expressly agreed.

Section 8 – Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be
   interpreted to, reduce, limit, restrict, or impose conditions on any use of
   the Licensed Material that could lawfully be made without permission under
   this Public License.

b. To the extent possible, if any provision of this Public License is deemed
   unenforceable, it shall be automatically reformed to the minimum extent
   necessary to make it enforceable. If the provision cannot be reformed, it
   shall be severed from this Public License without affecting the
   enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure
   to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a
   limitation upon, or waiver of, any privileges and immunities that apply to
   the Licensor or You, including from the legal processes of any
   jurisdiction or authority.

The full text of the CC BY 4.0 license is available at:
https://creativecommons.org/licenses/by/4.0/legalcode