Short description of PDFBlackbox VCL 8.0: PDFBlackbox (VCL Edition) is a comprehensive collection of native components that help you compress, encrypt, sign and timestamp PDF documents from your Delphi, C++Builder or FreePascal applications. Both symmetric and certificate-based (X.509) encryption and signing is supported. VCL edition can be used with Delphi 4-7, Delphi 2005-2010, C++Builder 2007-2010, FreePascal.