Looking at the private dictionary for pydicom:
# Generates output from a file from the MDCM project (http://code.google.com/p/mdcm),
The only issue is that mdcm is LGPL, while pydicom claims to be MIT... There is a clear conflict of license here.
So I filled in a bug report:
I cannot believe they prefered to used the dictionary from mdcm, instead of using the easy-to-parse XML dictionary from GDCM