PDF/A Viewer Mode
The PDF/A specification also states some requirements for a conforming PDF/A reader, which must
- ignore any data that is not described by the PDF and PDF/A standards;
- ignore any linearization information provided by the file;
- only use the embedded fonts (rather than any locally available, substituted or simulated fonts);
- only display using the embedded colour profile;
- ensure that form fields do not change the rendered presentation and are rendered without regard to the form data;
- ensure that annotations are rendered consistently.
Some PDF viewers (e.g., Adobe Reader 9) will by default switch into a special "PDF/A viewing mode" to fulfil these requirements whenever a document declares in its metadata that it is PDF/A compliant. This may also alert the user that this mode has been activated, and disable functions for changing the document.
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