A small correction: I believe OpenDDR says they are using the database of April 2011:
One of the sources we looked at was the content of the file wurfl.xml, in its version dated April 24th 2011,

In fact, they explicitly state that no data from the July 2011 archive is used:
no data coming from July 2011 Snapshot has been used in OpenDDR, while April 2011 version has been used instead.

Unless OpenDDR is lying about this, I can see no basis for accusations on grounds of either copyright or licensing related issues.