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No, it doesn't appear to have changed.
It's possible that your passphrase/"Hash" changed between your downloads.
B&N has had a really stable DRM, compared to the other provider who changes their algorithms a lot more rapidly.
They've also been a lot better about using largely compliant EPUB as opposed to a difficult to convert format.
It's also possible in the next few days that the B&N Network protocol will change over, and this may break older software.
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