They indicate what printing the book is on.
A set of letters or numbers on the copyright page generally refers to the number of the printing or edition of the book.
Websites generally give the current year as the copyright year, as that is when the page rendered. Wiki.answers.com has a copyright notification at the bottom of every page.
The explanation at the bottom of a page is typically referred to as a "footer." Footers often contain information such as page numbers, dates, authorship, copyright notices, or navigation links. They provide additional context or details related to the content on the page.
Most websites give the copyright year as the current year, because that's when the page rendered. See at the bottom of this page, Copyright [current year] Answers Corporation.
A reference placed at the bottom of a page is called a footer. It typically includes information such as page numbers, copyright details, or additional notes relevant to the content on that page. Footers help provide context and attribution for the information presented on the page.
Medicinenet.com has a copyright notice at the bottom of each page. In general, websites give the current year as the copyright year, as that's when the page rendered on the user's computer.
A copyright notification usually consists of the copyright symbol, the year, and the rightsholder. For example, see the notification at the bottom of this page.
Generally numbers (or letters) on a copyright page refer to an edition number so "12" would either mean a 12th edition or if they are 1,2 in sequence then a third edition.
Generally the copyright symbol does not appear with the name (as it would for a trademark); it usually appears at the bottom of the first page, with the year of copyright and the rightsholders name. For example, see the bottom of this page.
Websites typically give the copyright date as the year the page was generated; therefore you'll see at the bottom of this page Copyright © [current year] Answers Corporation
Yes; please see the notification at the bottom of each page.
Websites usually give the current year as the copyright year, as that's when the page rendered. In the case of WikiAnswers, there is a notification at the bottom of every page.