![]() They do not support enforcing the permissions set in the certifying signature when opening a certified PDF document. Note: Our products currently only support adding a certifying signature. PERM_FORMFILL_SIGNATURE_COMMENTS (3): Permitted changes are the same as for 2, as well as annotation creation, deletion, and modification other changes invalidate the signature. PERM_FORMFILL_SIGNATURE (2): (Default) Permitted changes are filling in forms, instantiating page templates, and signing other changes invalidate the signature. Since the PDF format does not inherently support multiple digital signatures, Qoppa’s PDF. Appearance of digital signatures was improved to allow validation of multiple signatures. PERM_NOCHANGES (1): No changes to the document are permitted any change to the document invalidates the signature. A certifying signature is the first digital signature applied to a PDF document and allows specifying what subsequent changes may be made to the certified document. SetPermissions(int) to set the level of permissions on the certified PDF document.There are predefined ints in the class to use for the permission levels: SetCertifyingSignature(true) to specify that this signature is a certifying signature. SigningInformation is the object passed on when signing a document. We’ve added 2 new methods in SigningInformation to make it possible to add a certifying signature. ![]() How to add a certifying signature using Qoppa’s PDF library? ![]() You can read more about PDF certifying signatures in the PDF 1.7 Reference on page 733.
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