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Having been a database administrator for years, I have my own numbering scheme - for airmail is shown here: this is not copyrighted - you may use it
You have chosen not to exercise your copyright, good for you! I applaud you!
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However, a number sequence is not copyrightable as long as a similar numbering sequence does not deviate identically. So if you do not follow where Scott uses suffixes or skips a number, you have a different numbering system.
Not quite. What you have done is added onto the Scott numbering system. You have still incorporated the basic copyrighted Scott numbering system. You can do that, but the deviation must exceed a certain percentage, depending on the type/format of the item copyrighted.
What you have done is the equivalent of taking a movie, included a frame around the screen, removed a couple of scenes, and then added in a few alternate scenes of your own. The problem is that everybody is acknowledging that you are basing your system from ONE catalog system. Construct a new system based on info culled from several catalog systems, and you are less likely to run into problems.
Again, for your own personal use, it is not a copyright infringement. It is when you publish/distribute it (non-educational) that results in the violation.
I think it is great that you and the others are making great personal use of the Scott numbering system. I'm all for customizing things to suit each collector's needs and specialties!

Rather than keep quoting from the various posts above, please note:
The Scott numbering system is NOT a chronological sequence, so the claim that they cannot copyright it is invalid. Neither is it intuitive -- there are plenty of people who disagree with Scott number assignments. Also, the very fact that Scott/Michel/Y&T/SG do NOT have the same catalog number assignments shows that it is not intuitive. The many gaps in the numbering system also show it is constantly changing over the decades, and hence, not intuitive.
Regardless of how you and I feel (I personally agree you all should be able to use it in the manner you have posted), the fact is Scott has a valid copyright (nobody has successfully challenged it over a 100 year period), and they have chosen to protect its copyright.
I read a lot of posts claiming nobody can copyright a numbering system such as Scott's, including references to statements from lawyers. I read the statements, and it's clear the lawyers have misunderstood the Scott numbering system -- they are not collectors and have just assumed the Scott numbering system is a simple 1,2,3 numbering. When I see a lawyer successfully challenge this (not just in philately, but also in science, mathematics, manufacturing...) I will believe it. There is a reason why no lawyers are pro-actively challenging these numbering systems -- they wouldn't win.
Don't get me wrong. While I can understand why Scott vigorously protects its copyright and agree that they have the legal right to do so, I think Scott is shooting themselves in the foot. Especially in the age of the internet, it is a losing battle. Instead, Scott should be embracing public use, as there are many potential financial benefits to Amos. My opinion. However, they have decided to follow a different business model. Their business, their choice.
One of the shortest posts in this thread sums it up best:
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I beleive Scott originated the numbering system, it did not just appear on the hill one day. They created it, they can copyright it. Simple as that.