PDF versions
This product supports PDF versions 1.0 to 2.0; this topic summarizes which features are supported in each version. Features not mentioned here are supported in all versions. PDF files created by the product can be from versions 1.3 to 2.0 or PDF/A (based on version 1.4).
Encryption
40-bit RC4: Supported in PDF version 1.1 and above (security revision 2)
128-bit RC4: Supported in PDF version 1.4 and above (security revision 3)
128-bit AES: Supported in PDF version 1.6 and above (security revision 3)
256-bit AES: Supported in PDF version 1.7 and above (security revision 3)
Document permissions
The available set of document permissions depends on the security revision number (defined in the PDF standard). Two security revisions are used: 2 and 3.
Security revision 2 (RC4-40 encryption) allows the document creator to restrict the following operations:
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Modifying the document content
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Copying text and graphics from the document
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Adding or modifying text annotations and interactive form fields
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Printing the document
Security revision 3 (RC4-128, RC4-128 or RC-256 encryption) adds the following operations to the repertoire the document creator can control:
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Form fill-in and document signing
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Text inspection for accessibility
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Document assembly including insertion, deletion of pages and creation of bookmarks and thumbnails
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Allow only printing that does not allow perfect digital copies and results in degradation of output quality.
Metadata
Metadata fields are supported in PDF version 1.1 and above.
PDF standards
PDF/A: Supported in PDF version 1.4 only.
| PDF/A |
PDF/A is a standard designed to be usable in wide range of applications and operating systems and also withstand future technological developments. PDF/A is started with PDF version 1.4, so earlier PDF products can handle them. It excludes elements such as JavaScript, which may not be correctly interpreted in some environments. It requires certain items, such as adequate tagging, good accessibility, and suitable metadata.Power PDF supports the following PDF/A versions:
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