> The distribution of modified PDB data including the records HEADER, CAVEAT, > REVDAT, SPRSDE, DBREF, SEQADV, and MODRES in PDB format and their mmCIF and > XML equivalents is not allowed.
I'm not sure what the PDB format is, so I might be wrong, but my intuition is that trying to stop people from distributing data in a certain file format would be non-free.
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