Forms lets you specify a custom XCI file that it can use for rendering. (See Configuring locations for Forms.) By default, Forms override some of the options specified in the XCI file, including the following:
config/present/xdp/packets
config/present/pdf/creator
config/present/pdf/producer
config/present/pdf/compression/compressObjectStream
You can select options that cancel the override for the options listed above, in which case Forms uses the values specified in the custom XCI file.