Unverified50% confidenceFactExact time
The PDF specification (ISO 32000) has undergone multiple revisions since its inception in 1993, accumulating a large number of vendor extensions and legacy features, such as incremental updates, object streams, cross-reference streams, multiple font embedding formats, encryption and permission dictionaries, and optional JavaScript actions.
1
Sources
50%
Confidence
Long-term
Relevance
10/26/2026
First Seen
Sources
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