By default, the AllowCopyPaste property is exAllowCopy | exAllowCut | exAllowPasteText | exAllowPasteImage (15), which indicates that all clipboard operations are allowed. The AllowCopyPaste property controls whether the control will automatically respond to clipboard operations:

• Copy (Ctrl+C), places selected content on the clipboard
• Cut (Ctrl+X), removes selected content and places it on the clipboard
• Paste (Ctrl+V), inserts clipboard content (text or image) at the current position

You can enable or disable individual operations by combining values from the AllowCopyPasteEnum enumeration using bitwise OR (| or Or).

For instance:

• exAllowCopy Or exAllowCut Or exAllowPasteText Or exAllowPasteImage (15), enable full clipboard support (default), 
• exAllowCopy Or exAllowPasteText (5), allow only copy and paste text
• exNoCopyPaste (0), disable all clipboard features
• exAllowCopy Or exAllowCut Or exAllowPasteText (7), all except paste image