At present, seals can no longer be used as a basis for judging authenticity. Before the country expressly stipulated that it should be printed on the copyright page of books. The copyright page is usually located on the back of the title page of a book, or on the last page of a book. However, in recent years, some stamps have stopped printing. The reason is that the initial printing quantity is too small, so there is "no need" to write them out. Conducive to "consultation with the author." Don't let the copyright owner find the clue.

The sealed version refers to the version of the book, which is directly printed on the document with the signature seal, which is different from the autograph. For example, the author engraves his signature on the seal and seals it directly where it is needed. This kind of book or material is called a printed version.