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Its a shame that there can't be some unity between the major catalogue players to help there clients - the collectors.
I can sympathize with everyone on this issue. It would be nice if the major catalog publishers would permit such a cross-reference. In fact, a few legal cross-references have existed in the past. The most recent one I can think of was the Scott-Minkus cross-reference for US stamps. Minkus paid a licensing fee to produce it. And Scott made them publish it separately as part of the licensing agreement.
I can also understand why the publishers have a very strong incentive to keep a tight lid on their numbering systems. It's a business, and they have to protect their intellectual property through copyright and licensing.
My beef with Scott is not with their copyright, but with their lack of innovation in making their catalogs more practical and affordable. They are digging their own grave with their current business model.
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Doesn't copyright lapse after 50 years or something?
Copyright rules and enforcement vary considerably among the different countries. Particularly the enforcement. Scott simply copyrights the new catalog every year. If you use a catalog from 50 years ago, you will find many Scott catalog numbers have actually changed. Any cross-reference system based on such old catalog numbers would not be sufficiently accurate. Also, the ace up their sleeve is that they have trade-marked most of their business phrases -- "Scott", "Scott's", "Scott number"... their lawyers might tie you up in court for years.
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Also I think copyright is only infringed when the information is sold (am I correct here?) If members were to post their lists for other members to use for free we could get quite a large conversion document going.
That is not correct. It does not have to be sold. It only has to be reproduced, distributed, or in any other way made available for viewing to a number of people that exceed "fair use". Legally, there are several exceptions, such as for library, education..., all of which fall under "fair use", but there is also a unwritten numerical limit to how many is considered "fair use". For instance, you cannot simply copy 10 pages from the Scott catalog as a teaching tool for a class of 100 people. You would have to ask for permission. This kind, Scott and most companies would very likely grant without licensing fees.
Scott does list certain permissions for use of its copyrighted work. However, term (c) in their list is designed to specifically preclude the use of their numbers in any sort of catalog (which by definition, would rule out a comprehensive cross-reference).
You ARE permitted by law to create your own cross-reference for any catalogs you own. To distribute them, unfortunatey, is a different story.

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