However, the font itself is long out of copyright, so that you or I could create our own version of the font from printed samples by digitising the font.
This happens all the time.
The other issue is that sometimes trademarks can get involved. In that the name of the font could be trademarked and thus the font offered some small protection in that it's hard to then find a duplicate font because it has to be called something different.
The original drawings for the type, by Percy Tiffin, are more like sketches or visuals – guidelines to give the punchcutter a direction rather than precise instructions. They bear little relation to the end product, so they are not the typeface in & of themselves. (I initially tried to use these as reference & after a couple of hours realised that they were pretty useless, containing no uniform measures, proportions or elements). The final 'outlines' for the type were created in the metal itself by the punchcutter, Edward Prince. He is responsible for drawing, or rather carving the form of the type straight onto the steel punches from which the final type moulds (matrices) were cast.
The name Doves Type® is copyrighted to protect my drawings. But if someone wants to go ahead and do what I did and recreate the type from the original printed sources there's nothing to stop them, as long as they do not use my font data as a basis for their font. It took me 5 years, on-&-off, to reach the stage where I was satisfied that I had captured the overall essence of the original. Though one can never recreate the patina of a letterpress type – the appearance of each glyph varies from word to word, line to line, page to page. That's why I prefer to call my digital type a facsimile.