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Bottom line -- those Scott Numbers are the closely guarded intellectual property of Amos Press and they charge a pretty price for the license fee if you want to use them in your catalog, website, etc.
In my view, the legal situation is much more complex than this. Many court decisions have found that numbering systems are not eligible for copyright or trademark protection. There is no legal reason why an online database, even a commercial one, cannot have a column labeled "Cat. No." or "No." and list a stamp identification number that is identical to a Scott catalog number. However, SCOTT is a registered trademark of Amos Press, and commercial use of "Scott" in a way that could connote a source relationship, sponsorship or licensing by Amos probably would engender a response by them. Therefore, most commercial providers opt to display Scott numbers, but use a designation such as "No.," "#", "Sc #" or something similar. You will see this in auction catalogs, dealers' lists, and innumerable other sources with no hint of licensing. Indeed, while the US Government has sovereign immunity from many IP claims, the national stamp collection on display at the Smithsonian includes Scott number designations denoted simply by a dash. For example, next to Scott No. 2, the 1847 10c Washington, appears "- 2". It's important to recognize that the numbering system per se is not protected or subject to liability, but commercial use of the Scott brand may be.
Having said this, because the financial resources of Amos are significant, many commercial providers elect not to reproduce Scott numbers to avoid any hint of a dispute. It is sad that an IP owner can cause a chilling effect of this type. And as others have written, Scott is not the only catalog, so StampWorld may have elected to avoid the debate about which catalog number series should be used (Scott, Stanley Gibbons, Michel, etc.).
Private conduct by individual collectors is subject to different analysis. If I privately prepare and print album pages for my own use with spaces labeled "Scott No. 2" etc., or prepare an inventory spreadsheet with a column labeled "Scott No.", Amos has no claim.
*The preceding is not legal advice. If this message contained legal advice, it would be followed by a bill.*