PDF Attribute Editor 1.1

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The term metadata literally means ‘data about data’. Metadata provide additional information about a certain file, such as its author, creation data, possible copyright restrictions or the application used to create the file. The way metadata can be used in PDF files is described on this page. The content is geared towards the graphic arts industry but may be practical for other types of PDF usage as well. It covers:

  • The filename is metadata as well

How to view the metadata in a PDF file

To view metadata in a PDF document, open it with Adobe Reader or Adobe Acrobat and select ‘Properties’ in the File menu. The screen capture below shows the Additional Metadata window in Adobe Acrobat DC. Adobe Reader does not have this additional window.

Applications geared towards managing libraries of data can show metadata. Adobe Bridge, for example, allows you to browse through folders containing PDF files and check basic metadata such as the author, description, and copyright of PDF files. Theoretically operating systems should also be able to do this but while an operating system like Windows 7 is great at showing picture related metadata (such as the resolution, bit depths, keywords,.) or music related metadata (such as the artist, album, and genre), it fails to do so for PDF files.

Professional content management systems can not just display metadata but also allow for extensive searches based on the keywords or description field.

How to add or edit metadata

Many content creation applications, such as Microsoft Word, Adobe InDesign or Adobe Photoshop, allow users to define metadata for its files. In InDesign, for instance, you can use the ‘File Info’ menu option to define metadata such as the document title, its description, the author, keywords and copyright-related information. Such information is embedded in PDF metadata fields when the layout is exported to PDF.

PDF editing tools, such as Adobe Acrobat Professional, allow you to add metadata or edit them. For very specific types of metadata, a plug-in might be available to facilitate data entry or provide users with clear guidelines and choices for entering data. Tools like Exiftool allow you to extract or embed the metadata.

How to remove metadata

Metadata add value to a file but there may be circumstances where you want to remove them. This is sometimes a requirement for legal reasons or done because of security or privacy concerns.

  • If you have Adobe Reader select File > Properties which brings up the Document Properties window. This shows the most important metadata fields which you can delete by hand.
  • To remove metadata in individual files, you can also use the PDF Optimizer option in Adobe Acrobat. In Acrobat 9 Professional select Advanced > PDF Optimizer. In the window that pops up select the Discard User Data option to the left and enable the Discard document information and metadata checkbox to the right. If you need to clean dozens or hundreds of files, you can do so using the batch function of Acrobat Professional: select Advanced > Document Processing > Batch Processing. Click on New Sequence and name the new sequence (don’t worry about the Select sequence of commands box just click on the Output Options button at the bottom. In the Output options window activate the PDF Optimizer option and click on Settings, edit the Optimizer settings as desired and name the settings. When you are back at the Batch Sequences window run the sequence you just created, choose your files and let Acrobat do its thing.
  • If you have the Enfocus Pitstop plug-in for Acrobat, it includes an action for removing metadata. The Callas pdfAutoOptimizer tool has a similar function.
  • There are command line tools to batch clean PDF files as well as companies that offer this type of service for a fee. Google is your friend.

How metadata is stored in PDF files

PDF Attribute Editor 1.1

There are several mechanisms available within PDF files to add metadata:

  • The Info Dictionary (or info dict) has been included in PDF since version 1.0. It contains general information about a PDF file using a set of document info entries, simple pairs of data that consist of a key and a matching value. From PDF 1.1 onwards, these are the eight default keys that can optionally be filled in:
    • Author – who created the document
    • CreationDate – the date and time when the document was originally created
    • Creator – the originating application or library
    • Producer – the product that created the PDF. In the early days of PDF people would use a Creator application like Microsoft Word to write a document, print it to a PostScript file and then the Producer would be Acrobat Distiller, the application that converted the PostScript file to a PDF. Nowadays Creator and Producer are often the same or one field is left blank.
    • Subject – what is the document about
    • Title – the title of the document
    • Keywords – keywords can be comma separated
    • ModDate -the latest modification date and time

    The values must be text, no other types of data are allowed. Applications can add their own sets of data to the info dictionary.

  • Since PDF 1.4 (2001) a second and more elaborate mechanism, called metadata streams, is available to embed metadata in PDF files. A metadata stream can be associated with the overall document or it can apply to a single object within the file, such as a font or image. For its structure XMP (Extensible Metadata Platform) is used. XMP is a technology Adobe developed for embedding metadata into files. It can also be used in other file formats, such as JPG or SVG, and is an ISO-standard (ISO 16684-1). Like the info dictionary, an XMP packet can contain a simple list of name-value pairs. The data can however also be nested and a namespace can be used to standardize its structure. Since the XMP data is embedded in a stream, it can be compressed to reduce the file size.
  • Additional ways of embedding metadata are the PieceInfo Dictionary (used by Illustrator and Photoshop for application-specific data when you save a file as a PDF), Object Data (or User Properties) and Measurement Properties. Adobe Acrobat allows you to name or label pages with a meaningful description. Such page labels are metadata on the page level, since they can indicate which pages belong to the sports section of a magazine or are part of the index of a book.

PDF metadata standards

There are a number of standards for enriching PDF files with metadata. Below is a short summary:

  • There are PDF substandards such as PDF/X and PDF/A that require the use of specific metadata. In a PDF/X-1a file, for example, there has to be a metadata field that describes whether the PDF file has been trapped or not.
  • The GWG ad ticket provides a standardized way to include advertisement metadata into a PDF file using XMP.
  • Certified PDF is a proprietary mechanism for embedding metadata about preflighting – whether a PDF file intended to be printed by a commercial printer or newspaper has been properly checked for the presence of all fonts, images with a sufficient resolution,…
  • The GWG processing steps specification is fairly new and meant to standardize the way production information for the printing industry can be embedded in PDF files. This is done using both additional objects and metadata. By standardizing the way information about die cutting, embossing, varnishing, etc is included a PDF, it will become easier for brands, design agencies, converters and printers to collaborate and automate production.
  • The German ZUGFeRD standard for electronic invoices is an interesting twist on embedding additional data. A PDF invoice that is ZUGFeRD-compliant includes limited metadata in the XMP document metadata (e.g. the document type must be set to ‘INVOICE’) while the actual invoicing data are contained in an XML file that is embedded within the PDF.

The filename is metadata as well

The easiest way to add information about a PDF to the file is by giving it a proper filename. A name like ‘SmartGuide_12_p057-096_v3.pdf’ tells a recipient much more about what the file is about than ‘pages_part2_nextupdate.pdf’ does.

  • Add the name of the publication and possibly the edition to the filename.
  • Add a revision number (e.g. ‘v3’) if there will be multiple updates of a file.
  • If a file contains part of the pages of a publication add at least the initial folio to the filename. That allows people to easily sort files in the right order. Use 2 or 3 digits for the page number (e.g. ‘009’ instead of just ‘9’).
  • Do not use characters that are not supported in other operating systems or that have a special meaning in some applications: * < > [ ] = + ” / , . : ; ? % # $ & •. Do not use a space as the first or last character of the filename.
  • Don’t make the filename too long. Once you go beyond 50 characters or so people may not notice the full information or the filename may get clipped in browser windows or applications.
  • Many prepress workflow systems can automatically insert files into a job based on a specific naming convention. This speeds up the processing of the job and can avoid costly mistakes. Consult with your printer – they may have guidelines for submitting files.

Other sources of information

Enhanced Attribute Editor

Chapter 12 of Leonard Rosenthol’s book ‘Developing with PDF‘ is dedicated to metadata in PDF files. More information on XMP can be found on Wikipedia and the Adobe site. The B4print forum has a pretty good thread about removing metadata from which I picked up some useful information.

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Definition

Specifies the editor to use to change a property. This class cannot be inherited.

Inheritance
EditorAttribute
Attributes

Examples

The following code example creates the MyImage class. The class is marked with an EditorAttribute that specifies the ImageEditor as its editor.

The following code example creates an instance of the MyImage class, gets the attributes for the class, and then prints the name of the editor used by myNewImage.

Remarks

When editing the property, a visual designer should create a new instance of the specified editor through a dialog box or drop-down window.

Use the EditorBaseTypeName property to find this editor's base type. The only available base type is UITypeEditor.

Use the EditorTypeName property to get the name of the type of editor associated with this attribute.

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Attribute Editor In Maya

For general information on using attributes. see Attributes. For more information on design-time attributes, see Attributes and Design-Time Support.

Constructors

EditorAttribute()

Initializes a new instance of the EditorAttribute class with the default editor, which is no editor.

EditorAttribute(String, String)

Initializes a new instance of the EditorAttribute class with the type name and base type name of the editor.

EditorAttribute(String, Type)

Initializes a new instance of the EditorAttribute class with the type name and the base type.

EditorAttribute(Type, Type)

Initializes a new instance of the EditorAttribute class with the type and the base type.

Properties

File Attribute Editor

EditorBaseTypeName

Gets the name of the base class or interface serving as a lookup key for this editor.

EditorTypeName

Gets the name of the editor class in the AssemblyQualifiedName format.

TypeId

Gets a unique ID for this attribute type.

Methods

Equals(Object)

Returns whether the value of the given object is equal to the current EditorAttribute.

GetHashCode()

Returns the hash code for this instance.

GetType()

Gets the Type of the current instance.

(Inherited from Object)
IsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(Inherited from Attribute)
Match(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(Inherited from Attribute)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

Batch Attribute Editor

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.

(Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.

(Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.

(Inherited from Attribute)

Applies to