I have never done it. However, in the standalone DNG converter there is an "Extract" button at the bottom of the dialog. When you click on it you can choose a folder that contains DNG files containing embedded raw images. After you choose the folder, the DNG converter will extract the raw files.
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I see two possibilities:
If the DNG files resulted by using the "Copy as DNG" when Importing the originals into the LR catalog- then the 'Original raw' file was converted to DNG, and does not contain the 'Original raw' embedded.
If you used the Adobe DNG Converter program to convert raw to DNG, AND had the option checked to "embed the original" then the Converter can be used to extract the original.
Only in scenario-2 will you be able to restore the camera raw (NEF, CR2, etc)
Jim, thank you. I downloaded the Digital Negative Converter and was able to extract the original RAW files from the DNGs in which I had embedded the RAWs. I have been converting all my RAWs to DNGs for years and fortunately also embedding the original files. Now I'm starting to use Iridient Developer and their X and S Transformers since it's reputed to have a much better RAW conversion engine than that found in ACR or LR. My workflow has been to import DNGs into LR, process there and then finish in Pshop if necessary. However, Adobe in it's infinite wisdom seems to have neglected to include any reconversion capability in either ACR or LR in the CC versions which is all I use now. Thanks again for your help.