Foxit PDF Editor lets you view, navigate, measure, and comment on 3D content in PDF documents. To do this, you need to enable the 3D content in PDF documents by selecting the Enable the playing of 3D content option. If Safe Reading Mode and Protected View are disabled, with the option unselected, a dialog box pops up to ask whether you trust the document to enable the playing of the 3D content in the document when you open a 3D PDF file for the first time.
Note: By default, Safe Reading Mode is enabled, and whether the option has been selected or not, when you open a PDF with 3D content for the first time, a dialog box pops up to ask whether you trust the document to enable/activate the 3D content in it, and you can select an option to trust the document one time only or always trust the document. Selecting Trust this document always in the dialog box also adds the document to the privileged locations, and the dialog box will not prompt next time you open the PDF. See also Privileged Locations. Note that the dialog box does not necessarily pop up when you open a 3D PDF. Sometimes it pops up only when you click on the 3D content in the PDF. When it pops up is determined by the activation settings of the 3D content. And the message displayed in the pop-up dialog box varies depending on your trust settings for Foxit PDF Editor. See also Security settings and Trust settings.