In this case, the court found that subsequent editions to a book without alterations or additions should have the same copyright, because they find their only protection in the original copyright; but second or subsequent editions, with notes or other improvements, are new books, within the meaning of the copyright acts, and the authors or proprietors of the same are required to “deposit a printed copy of such book,” and “give information of copyright being secured,” as if no prior edition of the work had ever been published. The term of the copyright as to the notes or improvements, is computed from the time of recording the title thereof, and not from the time of recording the title of the original work. Copyrights afford no protection to what was not in existence at the time when they were granted.