Also, while other Editors might be able to use this functionality they all take use of software such as ActiveX or Java which requires an install on the user's machine. Telerik's RadEditor runs completely in-browser without the need of any extra installs!
What you can do is: for each one of those images you simply use the Image Manager that is found within the RadEditor's default list of tools. This will allow you to upload the necessary images to your RadEditor content.
Ah, I see what you're trying to achieve. Perhaps pasting the content as plain text will work in this case? I tested it in this online demo and it did indeed paste without any image tags. There is a thread that you can find here, with a very recent sample project posted at the end, that shows how to set up the plain text paste as the default paste when a ctrl+v occurs.