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            SECTION 8.6                                                                    Interactive Forms




                               TABLE 8.82 Entries in a signature field lock dictionary
KEY         TYPE             VALUE

Type        name             (Optional) The type of PDF object that this dictionary describes; if present, must be
                             SigFieldLock for a signature field lock dictionary.

Action      name             (Required) A name which, in conjunction with Fields, indicates the set of fields that
                             should be locked. Valid values are:
                                All            All fields in the document
                                Include        All fields specified in Fields
                                Exclude        All fields except those specified in Fields

Fields      array            (Required if the value of Action is Include or Exclude) An array of text strings containing
                             field names.




                            TABLE 8.83 Entries in a signature field seed value dictionary
KEY                 TYPE              VALUE

Type                name              (Optional) The type of PDF object that this dictionary describes; if present,
                                      must be SV for a seed value dictionary.

Filter              name              (Optional) The signature handler to be used to sign the signature field. Begin-
                                      ning with PDF 1.7, if Filter is specified and the Ff entry indicates this entry is a
                                      required constraint, then the signature handler specified by this entry must be
                                      used when signing; otherwise, signing must not take place. If Ff indicates that
                                      this is an optional constraint, this handler should be used if it is available. If it
                                      is not available, a different handler can be used instead.

SubFilter           array             (Optional) An array of names indicating encodings to use when signing. The
                                      first name in the array that matches an encoding supported by the signature
                                      handler should be the encoding that is actually used for signing. If SubFilter is
                                      specified and the Ff entry indicates that this entry is a required constraint, then
                                      the first matching encodings must be used when signing; otherwise, signing
                                      must not take place. If Ff indicates that this is an optional constraint, then the
                                      first matching encoding should be used if it is available. If it is not available, a
                                      different encoding can be used.

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