--- title: "Open-Source Notices | DuoCircle Trust" description: "Third-party open-source components included in DuoCircle SpamSentinel, Verisend, and Inbox Genius for HCL Notes and Domino. Mirror of the THIRD-PARTY-NOTICES.txt files shipped in each installer." image: "https://trust.duocircle.com/og-default.png" canonical: "https://trust.duocircle.com/open-source/" --- # Open-Source Notices Third-party open-source components included in our installable email-security products for HCL Notes and Domino. The notice files mirrored here match the `THIRD-PARTY-NOTICES.txt` bundled in each installer. Reviewed 2026-05-08. ## What this page is Each product below incorporates third-party open-source components. Those components remain licensed to you under their respective open-source licenses. The [Bonterms Software License Terms](https://bonterms.com/standard/software-license-terms-v1) govern only the proprietary portions of the software. The agreements are at [duocircle.com/legal/spamsentinel](https://www.duocircle.com/legal/spamsentinel/). ## Products covered All three products share a single license agreement. Notice files are shipped in each installer as `THIRD-PARTY-NOTICES.txt`. Notice files marked **Mirrored** are reproduced verbatim below. For a notice file marked **On request**, email [legal@duocircle.com](mailto:legal@duocircle.com). | Product | Description | Notices | | ----------------------------- | ----------------------------------------------------------------------------------------------- | ---------- | | [SpamSentinel](#spamsentinel) | On-premises spam filtering for HCL Notes and Domino servers. | Mirrored | | [Inbox Genius](#inboxgenius) | Inbox-side filtering and triage for HCL Notes and Domino, distributed under the same agreement. | Mirrored | | [Verisend](#verisend) | Visual email verification for HCL Notes and Domino, distributed under the same agreement. | On request | ## SpamSentinel for Domino Six third-party components are included in the current SpamSentinel installer release. Each component is licensed to you directly by its copyright holders under the license listed below. | Component | Version | License | Use in product | | ------------------------------------------------------------------------ | -------------- | ------------------ | ----------------------------------------------------------------------------------------- | | ARSoft.Tools.Net © Alexander Reinert, 2010-2014 | 1.8.2 / 2.2.9 | Apache License 2.0 | DNS client/server and SPF validation. | | BouncyCastle Cryptography Library © The Legion of the Bouncy Castle Inc. | 1.8.1 / 1.8.10 | MIT License | Cryptographic and certificate processing. | | MimeKit © Jeffrey Stedfast and contributors | 2.15.1 | MIT License | MIME parsing and email message processing. Modified for .NET Framework 3.5 compatibility. | | Newtonsoft.Json (Json.NET) © James Newton-King | 13.0.2 | MIT License | JSON serialization and deserialization. | | System.Buffers © Microsoft Corporation | 4.5.1 | MIT License | .NET runtime support library. | | System.Runtime.Numerics © Microsoft Corporation | 4.3.0 | MIT License | .NET runtime support library. | [Download SpamSentinel notices](/notices/spamsentinel-third-party-notices.txt) [Read inline below](#spamsentinel-text) ### Verbatim notice file, SpamSentinel THIRD-PARTY-NOTICES.txt Third-Party Open Source Software Notices SpamSentinel for Domino includes third-party open source software components licensed under open source licenses including the MIT License and Apache License 2.0. The following components are included in this product: ------------------------------------------------------------------------------- ARSoft.Tools.Net Version: 1.8.2 / 2.2.9 Copyright © 2010-2014 Alexander Reinert License: Apache License 2.0 Used for DNS client/server and SPF validation functionality. ------------------------------------------------------------------------------- BouncyCastle Cryptography Library Version: 1.8.1 / 1.8.10 Copyright © The Legion of the Bouncy Castle Inc. License: MIT License Used for cryptographic and certificate processing functionality. ------------------------------------------------------------------------------- MimeKit Version: 2.15.1 Copyright © Jeffrey Stedfast and contributors License: MIT License Used for MIME parsing and email message processing. This product includes a modified/customized version of MimeKit for compatibility with .NET Framework 3.5. ------------------------------------------------------------------------------- Newtonsoft.Json (Json.NET) Version: 13.0.2 Copyright © James Newton-King License: MIT License Used for JSON serialization and deserialization. ------------------------------------------------------------------------------- System.Buffers Version: 4.5.1 Copyright © Microsoft Corporation License: MIT License ------------------------------------------------------------------------------- System.Runtime.Numerics Version: 4.3.0 Copyright © Microsoft Corporation License: MIT License ------------------------------------------------------------------------------- APACHE LICENSE 2.0 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. [INSERT FULL APACHE 2.0 LICENSE TEXT HERE] ------------------------------------------------------------------------------- APACHE NOTICE ARSoft.Tools.Net - C# DNS client/server and SPF Library Copyright 2010..2014 Alexander Reinert ------------------------------------------------------------------------------- MIT LICENSE MIT License Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE 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 AUTHORS OR COPYRIGHT HOLDERS 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. ## Inbox Genius One third-party component is included in the current Inbox Genius installer release. | Component | Version | License | Use in product | | ------------------------------------------------------------ | ------- | ------------ | ----------------------------------------------------- | | curl / libcurl © Daniel Stenberg and contributors, 1996-2020 | 7.68.0 | curl License | HTTP/HTTPS communication and web service integration. | [Download Inbox Genius notices](/notices/inboxgenius-third-party-notices.txt) [Read inline below](#inboxgenius-text) ### Verbatim notice file, Inbox Genius THIRD-PARTY-NOTICES.txt Third-Party Open Source Software Notices Inbox Genius includes third-party open source software components licensed under permissive open source licenses. The following components are included in this product: ------------------------------------------------------------------------------- curl / libcurl Version: 7.68.0 Copyright (c) 1996 - 2020 Daniel Stenberg and contributors License: curl License Used for HTTP/HTTPS communication and web service integration. ------------------------------------------------------------------------------- CURL LICENSE COPYRIGHT AND PERMISSION NOTICE Copyright (c) 1996 - 2020, Daniel Stenberg, , and many contributors, see the THANKS file. All rights reserved. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE 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 OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 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. Except as contained in this notice, the name of a copyright holder shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization of the copyright holder. ## Verisend The current Verisend installer ships its own `THIRD-PARTY-NOTICES.txt`. We have not yet mirrored it here. Email [legal@duocircle.com](mailto:legal@duocircle.com) with your installed version and we will send the matching notice file the same business day in most cases. ## How open-source licensing works in these products Each open-source component bundled in SpamSentinel, Verisend, or Inbox Genius is licensed to you directly by its respective copyright holders under that component's own license. The Bonterms Software License Terms in the proprietary agreement do not override or replace those open-source licenses. Full Apache License 2.0 text is available at [apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0). Full MIT License text is included verbatim in the SpamSentinel notice file above. Full curl License text is included verbatim in the Inbox Genius notice file above. If a component is licensed under terms that require availability of corresponding source code, the source is either upstream-public or available on request from [legal@duocircle.com](mailto:legal@duocircle.com). We honor written requests within the timelines required by the applicable license. Notices and license texts are reviewed at each major installer release. The notice file is the authoritative list for that release. If you find a discrepancy between the notice file and what you observe in the installer, please tell us at [legal@duocircle.com](mailto:legal@duocircle.com) so we can correct it. ## Need source code or a different installer's notice file? Email [legal@duocircle.com](mailto:legal@duocircle.com) with the product and version. Same business day in most cases. [Email legal@duocircle.com](mailto:legal@duocircle.com) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://trust.duocircle.com","logo":{"@type":"ImageObject","url":"https://trust.duocircle.com/duocircle-logo.png"},"description":"DuoCircle Trust Center publishes our security posture, compliance program, and standardized vendor assessment responses for enterprise procurement teams.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.linkedin.com/company/duocircle","https://www.facebook.com/duocirclellc","https://x.com/duocirclellc"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://trust.duocircle.com/request/"},"knowsAbout":["SOC 2 Type II","CSA STAR","HECVAT","Vendor Security Assessment","Cloud Security","Email Security Compliance","Information Security Policies","Subprocessor Management","Data Protection Addendum"]} ``` ```json {"@context":"https://schema.org","@type":"WebSite","name":"DuoCircle LLC","url":"https://trust.duocircle.com","description":"DuoCircle Trust Center publishes our security posture, compliance program, and standardized vendor assessment responses for enterprise procurement teams.","publisher":{"@type":"Organization","name":"DuoCircle LLC","url":"https://trust.duocircle.com","logo":{"@type":"ImageObject","url":"https://trust.duocircle.com/duocircle-logo.png"},"description":"DuoCircle Trust Center publishes our security posture, compliance program, and standardized vendor assessment responses for enterprise procurement teams.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}}} ``` ```json {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Trust Center","item":"https://trust.duocircle.com/"},{"@type":"ListItem","position":2,"name":"Open-Source Notices","item":"https://trust.duocircle.com/open-source/"}]} ```