Why is this sonata Non PD in EU? Editors don't have copyright lifetime+70, but only 25 years after publication (scientific editions)
Yes, but sorry, which kind of copyright is relevant here? What did the editor do that could be more than a scientific edition?
Okay, but at least in german copyright law these additions have no threshold of originality. In the most they could be equated with scientific editions, which are 25 ys after first publishing. I an sure that practical editions, fingerings e.g. are not protected lifetime+70. They are rather musical handcraft than proprietary creations.
Okay, maybe this is the law situation in other countries. Here in germany, these extensions (expressly new performance indications and fingerings) are not copyrigthted, maximum 25years. I had a look on corresponding web sources. Even the reconstruction of missing parts ist 25y only. Seems it's the situation in germany only.