This process called Flattening. You can flatten your PDF through the Actions menu when the file is open, or through the Manage Files menu on the main screen.
convenience, every time you're exporting a PDF file outside GoodReader, the app offers you a choice of how to export it - either as-is or flattened.
In the main app Settings
, you can set the switch to
disallow the subsequent unflattening
of the file. Please note that this switch is only respected by the GoodReader app. There is no guarantee that other PDF editors will respect
that restriction. However, it is also worth mentioning that other apps rarely, if ever, offer an option of unflattening at all.