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DigiDoc (Digital Document) is a family of digital signature- and cryptographic computing file formats utilizing a public key infrastructure.It currently has three generations of sub formats, DDOC- , a later binary based BDOC and currently used ASiC-E format that is supposed to replace the previous generation formats.
Aggregate signature – a signature scheme that supports aggregation: Given n signatures on n messages from n users, it is possible to aggregate all these signatures into a single signature whose size is constant in the number of users. This single signature will convince the verifier that the n users did indeed sign the n original messages.
The PDF24 Creator is also able to merge multiple documents to one PDF file and to extract pages. Compressing PDF files to shrink the file size is also possible. Since version 10.0.0 an added toolbox is present as well. Some features of the software include, but are not limited to: [5] [6] Merge multiple PDF into one file
Default PDF and file viewer for GNOME; replaces GPdf. Supports addition and removal (since v3.14), of basic text note annotations. CUPS: Apache License 2.0: No No No Yes Printing system can render any document to a PDF file, thus any Linux program with print capability can produce PDF files Pdftk: GPLv2: No Yes Yes
PDF/UA is not a separate file-format but simply a way to use the familiar PDF format invented by Adobe Systems and now standardized as ISO 32000. [5]In general PDF/UA requires Tagged PDF (ISO 32000-1, 14.8), but adds a variety of qualitative requirements, especially regarding semantic correctness of the tags employed: [6] [7]
If signatures are required, cardholders sign a receipt after a purchase, and the merchant or retailer compares the signature on the receipt to an official signature on the back of the credit card.