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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License

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Sideletter for Contributions to the MoonMath Manual To zk-SNARKs (the "Sideletter")

between Least Authority TFA GmbH, Thaerstraße 28a, 10249 Berlin (hereinafter referred to as "Least Authority") and any natural person or legal entity submitting Contributions to the MoonMath Manual (hereinafter referred to as "You" or "Your").

Preamble

(A) Least Authority is the initial creator of the so-called MoonMath Manual To zk-SNARKs (the "Manual") which serves as a resource for anyone interested in understanding and unlocking the potential of the so-called "zk-SNARK" technology ("zk-SNARK"). The acronym zk-SNARK stands for “Zero-Knowledge Succinct Non-Interactive Argument of Knowledge” and refers to a cryptographic technique where one can prove possession of certain information without revealing the information itself. Most explanations struggle to clarify how and why they work. Resources are scattered across blog posts and GitHub libraries. This results in a high barrier to entry, thereby slowing the widespread adoption of zk-SNARKs and associated privacy-enhancing technologies.

(B) Least Authority wants to change that with the Manual by continuing the Manual as a community-based project to collect useful and practical information on the zk-SNARK. Third-party authors like You shall be able to contribute parts, ideas and practical information to the Manual.

(C) The Manual itself is licensed under the Creative Commons Public License, version Attribution-NonCommercial-NoDerivatives 4.0 International ("CC BY-NC-ND-4.0"), which allows usage and distribution as well as modification of the Manual. However, if You modify the Manual or create "Adapted Material" of the Manual in the sense of Section 1.a. of the CC BY-NC-ND-4.0, those are not allowed to be distributed by You because Section 3.a.1. subsection 2 of the CC BY-NC-ND-4.0 prohibits the distribution of Adapted Material.

(D) If You wish to participate in the Manual, You can submit Adapted Material on the Manual as well as material created independently from the Manual ("Independent Creations") to Least Authority. If You are interested in adding a major Contribution to the Manual, please contact Least Authority directly under [email protected] and we can discuss if Your contribution can be handled individually with different terms.

(E) Subject of this Sideletter shall be the licensing of Your Contribution to Least Authority.

Now it is agreed as follows:

§ 1 – License on Your Submitted Contribution

(1) You can contribute any written work, graphic, calculation method, compilation of information, database, or any other work of authorship, including any modifications or additions to the Manual that is created by You by submitting it to Least Authority for the purpose of the inclusion in the Manual, regardless of whether it is an Independent Creation or Adapted Material (each of them a "Contribution"). "Submission" in this sense includes any form of electronic, verbal, or written communication sent to Least Authority under [email protected] or uploaded to https://github.com/LeastAuthority/moonmath-manual. For clarity: Least Authority is not obligated to include Your Contribution in the Manual.

(2) You hereby grant Least Authority a perpetual, worldwide, non-exclusive, sublicensable, irrevocable and royalty-free right to use, modify, edit, make publicly available and distribute Your Contribution intangible and intangible form or any other way now known or in the future developed in their original or modified way (within the limits of the prohibition of defacement), as well as to combine it in the original or modified way with or into the Manual ("License"). The License does at least include all rights required to license the Contribution under the CC BY-NC-ND-4.0 and in particular allows Least Authority to use, modify, edit, make publicly available and distribute in tangible and intangible form or any other way now known or in the future developed the Contribution as part of the Manual. Least Authority hereby accepts the grant of the License.

(3) If Least Authority decides that Your Contribution or parts thereof shall be included in the Manual, Least Authority will ensure the following: a) the Contribution as part of the Manual is licensed under the CC BY-NC-ND-4.0, b) You will be identified as a Contributor (including by pseudonym if designated) in the Manual. The rule § 1 (3) b) only applies if Your name or pseudonym is supplied with the Contribution.

(4) In case Least Authority decides that only parts or revisions of Your Contribution will be included in the Manual, Least Authority will inform You within a reasonable period of time and obtain Your consent to license the parts / revisions of Your Contribution corresponding to §1(2). No consent is needed if only editorial changes are made by LeastAuthority. In case You decide to submit Your Contribution with no information to contact You, this clause § 1 (4) shall not apply since Least Authority has no possibility to obtain Your consent.

(5) In case Least Authority decides that Your Contribution will not be part of the Manual, Least Authority shall use reasonable means to inform you on its decision within a reasonable period of time after Your Submission. The License You granted to Least Authority ends with the decision by Least Authority not to include the Contributions into the Manual.

§ 2 – Disclaimer

(1) Unless otherwise separately undertaken by You, to the extent possible, You offer the Contribution as-is and as-available, and make no representations or warranties of any kind concerning the Contribution, whether express, implied, statutory, or other. This includes, without limitation, warranties of title, merchantability, fitness for a particular purpose, non-infringement, absence of latent or other defects, accuracy, or the presence or absence of errors, whether or not known or discoverable. Where disclaimers of warranties are not allowed in full or in part, this disclaimer may not apply to You.

(2) To the extent possible, in no event will You be liable to us 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 Side Letter or use of the Contribution, even if You have 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.

(3) The disclaimer of warranties and limitation of liability provided above shall be interpreted in a manner that, to the extent possible, most closely approximates an absolute disclaimer and waiver of all liability.

§ 3 – Miscellaneous

(1) This Sideletter is valid without signature. It is concluded between You and LeastAuthority at the time of the submission of the Contribution by You to Least Authority.

(2) This Sideletter and its interpretation and any non-contractual obligations in connectionwith it are subject to German substantive law. The UN Convention on Contracts for the International Sale of Goods (CISG) shall not apply.

(3) English language terms used in this Sideletter describe German legal concepts only and shall not be interpreted by reference to any meaning attributed to them in any jurisdiction other than Germany. Where a German term has been inserted in brackets and/or italics it alone (and not the English term to which it relates) shall be authoritative for the purpose of the interpretation of the relevant term whenever it is used in this Agreement.

(4) Should one or more provisions of this Sideletter be or become invalid or unenforceable in whole or in part, this shall not affect the validity and enforceability of the remaining provisions of this Sideletter. In place of any Standard Terms of Business (Allgemeine Geschäftsbedingungen) which are invalid or not incorporated in the Sideletter the statutory provisions shall apply (§ 306 (2) of the German Civil Code (BGB)). In all other cases, the parties shall agree a valid provision to replace the invalid or unenforceable provision which reflects as closely as possible the original economic purpose, provided a supplementary interpretation of the Sideletter (ergänzende Vertragsauslegung) does not have precedence or is not possible.

(5) Amendments and additions to this Sideletter shall be valid only if made in writing. This also applies to any amendment to this written form clause.

(6) Any disputes arising out of or in connection with this Sideletter, including disputes on its conclusion, binding effects, amendment and termination, shall be dealt with exclusively by the competent court in Berlin, Germany, if legally possible.