The copyright in the images that appear on the faces of the Rider-Waite cards (hereinafter referred to as the “Rider-Waite Deck Images”) is owned by the Estate of AE Waite, or its legatee, and is exclusively licensed to U.S. Games Systems, Inc. (“USGS”) in, among other places, the United States and Canada. Any use of the Rider-Waite Deck Images – whether as they appear on the Deck itself or as line drawings -- must be approved by USGS; use without permission constitutes a copyright infringement under applicable laws.
The existence, or lack of existence, of a copyright in The Pictorial Key to the Tarot (as to which USGS takes no position) does not affect, and is not relevant to, the copyright in the Rider-Waite Deck Images. This is because the Rider-Waite deck was published prior to, and separate from, such book, and is the subject of separate copyright protection. The fact that you own a copy of The Pictorial Key to the Tarot which includes line drawings of the Rider-Waite Deck Images, does not give you the right to reproduce the Rider-Waite Deck Images, any more than, for example, your ownership of a copy of a DVD would allow you to reproduce and market images taken from that DVD. Accordingly, payment and credit will be required in connection with use of the Rider-Waite Deck Images on the boxes that you intend to market.
As noted, USGS does not claim any rights in The Pictorial Key to the Tarot, and does not require any payment for use of any of the text of such work (as opposed to use of the Rider-Waite Deck).