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Add digital signatures to PDF documents - GUI and CLI, cross-platform
...Cross-platform (Windows, Linux, macOS), built on the OpenPDF library, and translated into many languages by its community, JSignPdf is a trusted choice for anyone who needs reliable PDF signing without commercial licensing.
INTIX-JSIGNER is a java web application for signing documents (XML and/or PDF) of unattended way and in the server side. It has as main modules the following: Authentication, XML and PDF Signing and Keys and Certificates Management.
The Watermarks is a java library for images and text watermarking fingerprinting and tamper-proofing. The supported carrier formats for a watermark are JPEG and PDF. The project also aim to build a test environment to evaluate robustness of implemented a