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One such powerful library designed for C# development offers comprehensive features for programmatically adding digital signatures to PDFs. This library enables developers to create digital certificates, sign PDF documents using private keys, and validate signatures to ensure document integrity. By integrating this library into C# projects, developers gain access to a wide range of options for customizing the digital signature process. They can specify signature appearances, define signature positions, and include additional information, such as timestamps or reasons for signing. The library also facilitates the verification of digital signatures, ensuring that the signed PDF documents remain tamper-proof. Developers can verify the authenticity and integrity of the signatures programmatically, adding an extra layer of trust and security to their PDFs. The integration of the digital signature functionality is straightforward, thanks to the intuitive API and detailed documentation provided by the library. Developers can quickly understand the necessary steps and implement the code to programmatically add digital signatures to PDFs. The tutorial and source code are available at homepage With regular updates and dedicated support, this library remains up-to-date with the latest security standards and C# versions. It offers flexible licensing options to cater to the needs of individual developers and organizations of varying sizes. Adding digital signatures to PDFs programmatically is a crucial step in ensuring document integrity and security. By utilizing powerful libraries designed for C# development, developers can automate the signing process, customize signature appearances, and verify the authenticity of their PDF documents. This capability empowers C# developers to create trustworthy and secure PDFs, enhancing the overall reliability and professionalism of their applications.