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Copyright

Fun stuff Signet.
Regarding plans, the majority of plans that are 100, 200, and 300 years old are shrunk, stretched, taped, or otherwise not like the original. If I redraw the plans, tracing them does not work perfectly but can be modified so no one can say it is a copy. Also, using the appropriate contract or chart of scantlings when a contract is not available, dimensions can be fixed if they are not correct. With CAD, the drawings should be more exact than hand drawn. Based on the contract the gun deck beams on Agamemnon were sided 15.25" The drawing has them at 18" and as they are hand drawn, vary. (They are even smaller in the scantlings from the Shipbuilder's Repository 1788 and The Elements and Practice of Naval Architecture.)

There is fold/crease in the middle of the plan so the over length is off as well. At our scales, who will notice? The point is, if the plans have mistakes and they are redrawn because the contemporary plans have changed over time, would there still be a copyright issue unless the redrawn plan has the same mistakes.

Allan
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Regarding plans, the majority of plans that are 100, 200, and 300 years old are shrunk, stretched, taped, or otherwise not like the original. If I redraw the plans, tracing them does not work perfectly but can be modified so no one can say it is a copy. Also, using the appropriate contract or chart of scantlings when a contract is not available, dimensions can be fixed if they are not correct. With CAD, the drawings should be more exact than hand drawn. Based on the contract the gun deck beams on Agamemnon were sided 15.25" The drawing has them at 18" and as they are hand drawn, vary. (They are even smaller in the scantlings from the Shipbuilder's Repository 1788 and The Elements and Practice of Naval Architecture.)

There is fold/crease in the middle of the plan so the over length is off as well. At our scales, who will notice? The point is, if the plans have mistakes and they are redrawn because the contemporary plans have changed over time, would there still be a copyright issue unless the redrawn plan has the same mistakes.

From a legal point of view, these old plans are not treated as designs that could potentially be protected by patents, but are treated like any other works of a general graphic nature, such as artistic paintings, sketches, photographs etc. (for this reason, no specific technical features of the design presented in them are relevant when assessing possible copyright infringements). As a result, possible copyright infringements of these plans are considered on exactly the same basis as any other graphic work of an artistic nature.

The original content of these plans cannot be protected by copyright, if only because of the passage of time, and in most, if not all, countries such protection is limited by law to a few decades. In contrast, later images of these original plans, made by photographing, scanning, redrawing, etc., are subject to copyright protection.

In conclusion, if you redraw such an old plan (even on the basis of a legally protected copy), especially with the graphic modifications you indicate, not only will you not infringe anyone's rights, but your creation will also be protected by law.

There is also the question of commercial or non-commercial public reproduction of modern copies with valid legal protection, but in your specific scenario this is irrelevant.

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