DigiSigner is cross-platform application that simplifies the task of signing PDF documents with a digital signature. It uses standard X.509 certificates and cryptographically protects your documents, including the embedded pictures in your files. You can sign documents with visible/invisible signatures and verify them with DigiSigner.
DigiSigner has both a free and paid version. The free version is limited to basic features (Visible Signature, Invisible Signature, Signature Verification, Certificate Generation), whereas the paid version provides Smartcard/USB tokens, time stamp, server support, windows key store and one year email support. It works on Windows XP, Windows Vista, Windows 7 and Mac OS X.
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 Rewarded as an Excellent Freeware Program by the Primewares staff
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