PDFBlackbox.NET is a comprehensive collection of managed components that help you encrypt, sign and compress PDF documents from your .NET Framework applications. Both symmetric and certificate-based (X.509) encryption and signing is supported.

PDFBlackbox supports full range of PDF security operations, including

* PDF standard password-based data encryption and decryption using MD5 + RC4/40 or RC4/128 algorithms;
* PDF certificate-based public key data encryption and decryption using RSA algorithm and PKCS#7 format;
* certificate-based data signing and signature verification using SHA1 with RSA algorithms and PKCS#1 or PKCS#7 format;
* support for cryptographic hardware (USB cryptotokens and smartcards)
* ZLib compression;
* stream-based processing, which lets you handle huge amounts of data without significant memory requirements;
* support for PDF format versions 1.3 to 1.7

PDFBlackbox components are a clean-room implementation of PDF format specification, which don't use any third-party libraries for core functionality.

This is .NET edition, which can be integrated into Visual Studio 2008, 2005, 2003, Borland Delphi 2005-2007 /.NET. It requires .NET Framework 1.1, 2.0, 3.0 or 3.5, Mono (1.0 or 2.0) or .NET CF (1.0, 2.0, 3.5).