PDF digital signatures validation status

PDF Studio validates any digital signatures upon opening a document. PDF Studio will first check that the digital signatures in the document use valid certificates and that the document has not been changed. It will then check that the certificate used to issue the digital ID in the signature was issued by a trusted certificate […]

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How to make a PDF form non-editable

Q: Is there a way to make an interactive PDF form non-editable and make sure that fields data on the form can not be changed? A: You can make a PDF form non-editable by either using Document Permissions (Method 1 below) or by flattening the form fields (Method 2 below). Method 1: Use Document Security […]

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Open PDF document with an Open Password

Q: I password protected a PDF document. PDF Studio requires a password to open; however if I email it to my iPhone, the document seems unprotected and opens without asking for the password.  Is my document still secure? A: In the PDF specifications, there are 2 passwords: the open/user password to open the document and […]

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What are all the different document permissions in a PDF?

PDF Studio 9 and above will enforce and allow to clear the following permissions on a PDF documents: Document Permissions, Usage Rights Permissions, Digital Signature Permissions, and Certifying Signature Permissions. Protected PDF Document: Document Permissions PDF documents can be protected with passwords and permissions. Document permissions are set on a case by case basis and […]

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AES 256 Encryption and Java Cryptographic Encryption (JCE)

Q: When I open a document with AES 256 encryption, I get the following error message: “Encrypting or decrypting PDF documents with 256-bit AES encryption is supported but requires the Java Cryptographic Encryption (JCE)”. Does PDF Studio support opening PDF documents that were secured with AES 256 encryption and does it support encrypting PDF documents […]

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AES 256 algorithm and support in PDF Studio

PDF Studio 9 and above: Support for opening and encrypting PDFs with the latest algorithm AES 256 algorithm (R=6). This algorithm was defined in the latest PDF specifications (PDF 2.0) and is compatible with Acrobat X and later. The new algorithm is used when applying new signatures but the “old” algorithm (R=5) is still verified […]

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