REGISTERED TRADEMARKS
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Adobe, the Adobe logo, Acrobat and Reader are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries. 
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Microsoft Windows, Windows 2000, Windows Server, Windows Vista, Windows XP, Windows 7, Windows 10 are either registered trademark or trademarks of Microsoft Corporation in the United States and/or other countries. 
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COPYRIGHT NOTES
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Copyright (c) 2000 - 2018 The Legion of the Bouncy Castle Inc. (https://www.bouncycastle.org)
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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:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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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.
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OTHER LICENSES
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SignLib library is compiled using Microsoft Visual Studio 2013 and it is based on the The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org) library (version 1.8.4).
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To insert digital signatures or making other actions to PDF files, SignLib library calls an external library named iTextSharp 4.1.6. iTextSharp 4.1.6 library is licensed under MPL / LGPLv2. The original library is available here: https://www.nuget.org/packages/iTextSharp-LGPL/
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The source code of the original iTextSharp 4.1.6 library and all changes are available here: http://www.signfiles.com/license/SignLibSrc.zip
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iTextSharp 4.1.6 MPL / LGPLv2 License 
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iTextSharp is subject to the Mozilla Public License Version 1.1 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
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Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. 
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The Original Code is 'iText, a free JAVA-PDF library'. The Initial Developer of the Original Code is Bruno Lowagie. Portions created by the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
All Rights Reserved.
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Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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Contributor(s): all the names of the contributors are added in the source code where applicable.
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Alternatively, the contents of this file may be used under the terms of the LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the provisions of LGPL are applicable instead of those above.  If you wish to allow use of your version of this file only under the terms of the LGPL License and not to allow others to use your version of this file under the MPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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This library is free software; you can redistribute it and/or modify it under the terms of the MPL as stated above or under the terms of the GNU Library General Public License as published by the Free Software Foundation either version 2 of the License, or any later version.
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This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more details.
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Other copyright notes are available here: www.signfiles.com/license/LicenseAgreement.zip