I'm reasonably sure that the Walt Kelly estate maintains copyright on Pogo, even if some individual strips may have moved into public domain due to non-renewal or other such circumstances. Certainly, Selby Kelly used to come after people who put out unauthorized greeting cards and such. I'd be very surprised if she (or successors) let the lyrics lapse, whether or not she (or successors) have been very aggressive about enforcing said rights. (Trademarks lapse if you don't police 'em; copyrights lapse if you don't renew 'em, or after a set period.)
I also believe that the copyright and permissions requirements for song lyrics are far stricter than for most materials and offer little leeway for "fair use."
[This message has been edited by Otto Chelman (edited 12-26-2000).]
Posted by Otto Chelman
"You have [my] contempt." -- Alan Light to disappointed TBG subscriber.