| excerpt from PDF 1.7 spec (p. 674):
If set, the document contains signatures that may be invalidated if the
file is saved (written) in a way that alters its previous contents, as
opposed to an incremental update. Merely updating the file by appending
new information to the end of the previous version is safe (see Section
G.6, “Updating Example”). Viewer applications can use this flag to
present a user requesting a full save with an additional alert box
warning that signatures will be invalidated and requiring explicit
confirmation before continuing with the operation.
Parameters:
appendOnly - |
