Sustainability of Digital Formats: Planning for Library of Congress Collections
Sustainability of Digital Formats: Planning for Library of Congress Collections |
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | PDF/R-1, encrypted. Based on PDF 2.0 as defined in ISO 32000-2. ISO 23504-1: Document management applications -- Raster image transport and storage -- Part 1: Use of ISO 32000. |
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| Description |
A variant of PDF/R-1 designed for storing and transmitting scanned page image data that must be encrypted. It is based on ISO 32000-2 (PDF 2.0) in order to take advantage of more secure encryption than supported in ISO 32000-1. All restrictions on unencrypted PDF/R-1 files apply except that the Header must be %PDF-2.0 and the Crypt filter is allowed. The encryption employed must use the "Standard security handler" as described in subclause 7.6.4 of ISO 32000-2:2020. The only encryption algorithm supported is the AES algorithm with a key length of 256. |
| Production phase | See PDF/R-1. |
| Relationship to other formats | |
| Modification of | PDF/R-1, PDF/R (Raster image transport and storage) based on PDF 1.4-1.7. |
| LC experience or existing holdings | See PDF/R-1. |
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| LC preference | See PDF/R-1. |
| Disclosure | See PDF/R-1. |
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| Documentation |
The specification for encrypted PDF/R-1 documents is in the same document as the specification for unencrypted PDF/R-1 documents. The format for the encrypted variant is based on ISO 32000-2 (aka PDF 2.0), whereas the unencrypted variant is based on ISO 32000-1. See specification of PDF/R-1 as submitted for international standardization to the ISO/TC 171/SC 2. The ISO catalog record for PDF/R is https://www.iso.org/standard/75804.html. See also PDF/R-1. |
| Adoption | See PDF/R-1. |
| Licensing and patents | See PDF/R-1. |
| Transparency | See PDF/R-1. |
| Self-documentation | See PDF/R-1. |
| External dependencies | See PDF/R-1. |
| Technical protection considerations | The PDF/R-1 specification indicates that the variant based on ISO 32000-2 (PDF 2.0) should only be used for encrypted documents. |
| Still Image | |
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| Normal rendering | For all quality and functionality factors, see PDF/R-1 |
| Tag | Value | Note |
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| Filename extension | pdf |
Used for all PDF documents. See PDF_family. |
| Internet Media Type | application/pdf |
Used for all PDF documents. See PDF_family. |
| Magic numbers | %PDF-2.0 |
From PDF/R specification. |
| File signature | %PDF-raster |
The version of the PDF/R specification is identified in a comment line in the PDF trailer, located immediately before the line containing startxref. The form of the comment is %PDF-raster-x.y, where x is the major version number and y is minor version number. For the initial specification, the version is 1.0 |
| Pronom PUID | See note. | PRONOM has no entry for any variant of PDF/R as of June 2020. |
| Wikidata Title ID | See note. | There is no Wikidata Title ID for any variant of PDF/R as of June 2020. |
| General | |
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| History |
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