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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“There are a thousand hacking at the branches of evil to one who is striking at the root, and it may be that he who bestows the largest amount of time and money on the needy is doing the most by his mode of life to produce that misery which he strives in vain to relieve.”
—Henry David Thoreau (1817–1862)