in the element's hirarchy
of RadDocument have a IsCopyable
property which is set to false for PermissionRangeStart and PermissionRangeEnd. This is the behavior by design as copy/pasting a permission
range is not a straightforward action. If you wish to implement such behavior you can inherit from the above-mentioned classes and override the IsCopyable property.
The same applies for custom annotations which are also inlines
- if you want to be able to copy them, you should inherit from AnnotationRangeStart and AnnotationRangeEnd and override the IsCopyable property of the the custom annotation. More information on how to create a custom annotation can be found in this help article
I hope this helps!
All the best,