Portable Pdf Digital Signature(Portable PdfSigner) developed in Dotnet bases on iTextSharp, but compiled with mono, so it can run without .net framework, a really portable version, and it is free
The main feature is,

• Digital Sign a PDF document with PKCS#12 certificates
• Can modify meta data
• Supports multiple signatures.

Download here,

I developed it two years ago, it does not need Adobe Acrobat, for details, please visit here.

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