When is my RAW file changed? Upon import? Upon viewing? Only after edit list started?

All:
I now have a "second copy" made in a separate hard drive when I import files from my camera cards. I want an untouched file for possible comparative "developing" or rendering in DxO or PhotoNinja. Might convert everything to DNG someday.
Asking LR to do this at the top of the Import pane is I assume, creates a copy *and* makes NO changes to the RAW data.
OTOH, Lightroom will offer me the image in Camera Raw to view, create, and interpret my edit/develop decisions. But I have been thinking about this and need to ask all of you: Is that CR2 file in my dated Lightroom database folders a changed file in any way from the RAW file while it was still on the card? The decision to hold edit data in sidecar files plays a part in this, right?  External sidecar files means even after edits I can copy the CR2 file and use it in other [RAW]converter's software?
jonathan7007

Being a "non-destructive editor", Lightroom does not (cannot) change your CR2 files....with one exception, which is when/if you choose to edit the capture time of an image, in which case the changed date is written back into the file header's EXIF field. But apart from that, it is never ever changed.....all edits are stored primarily in the catalog's database, and optionally you can have them written into XMP sidecars. Having the XMP sidecar would allow you to open the raw file in another XMP-capable Adobe program, outside Lightroom, and see the edits applied. Not sure if other non-Adobe raw converters would be able to interpret all of that XMP info.
For non-proprietary raw files (e.g. DNG, Tiff), you can also choose to save the XMP data but in this case it would be written directly into the files header, not into sidecar files. The underlying image data is still, however, unchanged.

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