Category Archives: PDF Security

Signature valid or invalid. Adobe Reader is show "At least one signature has problems" message

How to tell if a Signature is valid or not? I have a process/workflow, at the end of the workflow, it saves the PDF form in the ContentSpace.The form has Signature fields.Server is LiveCycle ES 2.5, Turnkey. Windows/JBoss/MySQL.Client computer has … Continue reading

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Adobe Reader or Acrobat displays a "At least one signature has problems" message when signed PDF is opened. Signature validity is UNKNOWN. Signer's identity is unknown.

VeryPDF PDF Security and Signature (Shell & COM & SDK) http://www.verypdf.com/app/pdf-security-and-signature/try-and-buy.html GENERAL QUESTIONS ABOUT DIGITAL SIGNATURES What is a Digital ID? When traveling internationally, a passport adds a layer of security by providing a means of positively identifying a person's … Continue reading

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PDF Encryption Algorithms and Key Length

PDF encryption makes use of the following encryption algorithms: RC4, a symmetric stream cipher (i.e. the same algorithm can be used to encrypt and decrypt). RC4 is an older proprietary algorithm. AES (Advanced Encryption Standard) specified in the standard FIPS-197. … Continue reading

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PDF Online DRM Security :: PDF Copyright Protection with Digital Rights Management

Ensuring that your PDF files are fully protected against onward distribution (document copying/emailing), content copying and unauthorized printing - delivered using cost-effective and reliable software and services. Hassle-free document security for PDFs – anywhere, anytime! Protect document content Control document … Continue reading

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How to use wildcard character to batch encrypt all PDF files in a folder by encryptpdf command line application?

HI, I am orienting myself on buying command line encryptpdf.I have downloaded the demo version and have a question if it is possible to use wildmarks for the file names? And if so, how to us it. I have played … Continue reading

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