The subtitle to Jennifer Jenkins' post is, "Can Companies Use Copyright and Trademark To Claim Rights to Public Domain Works?" Of course they will try!  Jenkins provides excellent details about this, specifically regarding:

• What Happens When the Same Characters Appear in Both Public Domain and Copyrighted Stories?
• When Trademarks and Copyrights Overlap

If you're curious about what in the Pooh universe entered the public domain earlier this year or want to know more about how think about the distinctions between what is public domain and what is not, this post is for you!