code: def findProbableCopyright(self):
          
          retCopyrights = set()
          for R in self:
              begin, abS = findCopyright(R.get('abstract', ''))
              if abS != '':
                  retCopyrights.add(abS)
          return list(retCopyrights)
docs: Finds the (likely) copyright string from all abstracts in the `RecordCollection`
  
          # Returns
  
          `list[str]`
  
          > A deduplicated list of all the copyright strings