JHOVE 1.3

JHOVE provides functions to perform format-specific identification, validation, and characterization of digital objects.
The set of characteristics reported by JHOVE about a digital object is known as the objects representation information, a concept introduced by the Open Archival Information System (OAIS) reference model [ISO/IEC 14721].
The standard representation information reported by JHOVE includes: file pathname or URI, last modification date, byte size, format, format version, MIME type, format profiles, and optionally, CRC32, MD5, and SHA-1 checksums [CRC32, MD5, SHA-1].
Additional media type-specific representation information is consistent with the NISO Z39.87 Data Dictionary designed for digital still images and the draft AES metadata standard for digital audio.

Enhancements
- According to the PDF 1.6 specification, table 3.4, parameters for a
- stream filter can be either a dictionary or the null object. The null
- object was treated as an error; it is now allowed.
- Object stream handling was seriously buggy, causing rejection of
- well-formed and valid files; its better now.
- In PDF 1.4, an outline dictionary unconditionally must have a "First"
- and a "Last" entry. JHOVE follows this requirement, declaring a file
- invalid if it isnt met. However, PDF 1.6 relaxes the requirement,
- applying it only "if there are any open or closed outline entries."
- Thus, an empty outline dictionary with no "First" or "Last" entry
- is valid. It is now accepted (for all PDF versions).
- If a page number tree in a PDF file is missing an expected "Nums"
- entry, this was being reported as an invalid date. A more appropriate
- error message is now given.