IDEntry

Héritage et contrats

Parent : PDF\Specification\SchemaEntry

Définition dans la norme

Tableau 15 · Entries in the file trailer dictionary
ISO 32000-1:2008, §7.5.5 · page PDF 51 ↗

/ID array

(Required if an Encrypt entry is present; optional otherwise; PDF 1.1) An array of two byte-strings constituting a file identifier (see 14.4, "File Identifiers") for the file. If there is an Encrypt entry this array and the two byte-strings shall be direct objects and shall be unencrypted. NOTE 1 Because the ID entries are not encrypted it is possible to check the ID key to assure that the correct file is being accessed without decrypting the file. The restrictions that the string be a direct object and not be encrypted assure that this is possible. NOTE 2 Although this entry is optional, its absence might prevent the file from functioning in some workflows that depend on files being uniquely identified. NOTE 3 The values of the ID strings are used as input to the encryption algorithm. If these strings were indirect, or if the ID array were indirect, these strings would be encrypted when written. This would result in a circular condition for a reader: the ID strings must be decrypted in order to use them to decrypt strings, including the ID strings themselves. The preceding restriction prevents this circular condition.

Qualificateur : Required if an Encrypt entry is present; optional otherwise; PDF 1.1

Les descriptions conditionnelles restent traçables. La présence d’une définition ne réalise pas à elle seule un codec, une signature ou tous les traitements du format. Lire la couverture.

Construction

Méthodes héritées

Propriétés

Constantes

'ID'

'15'

false