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Below are the essential libraries required by PDF Viewer applications. All of them are considered legally redistributable under the DevExpress EULA.

Assembly Description
DevExpress.Data.v19.1.dll Provides the basic functionality for all DevExpress components.
DevExpress.Pdf.v19.1.Core.dll Contains classes that provide the basic functionality of WinForms and WPF PDF Viewers, and the PDF Document API.
DevExpress.Pdf.v19.1.Drawing.dll Contains classes required for drawing in WinForms and WPF PDF Viewers, and the PDF Document API.
DevExpress.Printing.v19.1.Core.dll Contains classes that provide the basic printing functionality.
DevExpress.Utils.v19.1.dll Contains basic utility classes and common skins.
DevExpress.XtraBars.v19.1.dll Contains toolbars, a menu and docking components.
DevExpress.XtraEditors.v19.1.dll Contains data editors.
DevExpress.XtraPdfViewer.v19.1.dll Contains classes required for the PdfViewer control in Windows Forms applications.
DevExpress.XtraTreeList.v19.1.dll Contains classes that are used to show bookmarks for a document.

Additional Assemblies

The The following libraries provide additional functionality for applications that use the PDF Viewer functionality.

Assembly Description
DevExpress.BonusSkins.v19.1.dll Contains extra skins (such as “Metropolis” and “McSkin”).
DevExpress.Dialogs.v19.1.Core.dll Contains internal classes that implement the core functionality for DevExpress dialogs for WinForms.
DevExpress.XtraDialogs.v19.1.dll Contains skinnable DevExpress counterparts for standard WinForms Open and Save File dialogs.