@hep2marc.over('<STR_LIT>', '<STR_LIT>')<EOL>@utils.for_each_value<EOL>def license2marc(self, key, value):
return {<EOL>'<STR_LIT:a>': value.get('<STR_LIT>'),<EOL>'<STR_LIT:b>': value.get('<STR_LIT>'),<EOL>'<STR_LIT:u>': value.get('<STR_LIT:url>'),<EOL>'<STR_LIT:3>': value.get('<STR_LIT>'),<EOL>}<EOL>
Populate the ``540`` MARC field.