COPY and read-only transactions

I probably made the original mistake in the code, so I refrain from claiming 
to know anything about Boolean logic, but this note in the release notes 
doesn't seem right:
 Fix the sense of the test for read-only transaction in COPY The code formerly prohibited COPY TO, where it should
prohibitCOPY FROM.
 

???

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/