Lem wrote:cleared content should only be defined by composer and copyright region. eg. +50, +70, +70-1923, 100, etc.
-not by piece
-not by state
I am not sure this will work so easily:
1. Because each New Year's Eve we would have to edit that field;
2. Because there are too many things under "etc." (A "+70-1923" in the USA may be a "+70-1921", or a +70between1921&1948" in France, and there the status is different; and so on everywhere. There also should be, only for the USA +70+1923butnoproofof©renewal, etc.
3. There should be the same filled for co-authors - think about vocal music. And rules for text authors may be different than for composers (e.g. in France, since a very recent case law).
4. There are also, on PD works, the editor and the edition protections, which may be different in each country, because of the delays, but also because of the various status of edition protection.
I think it is better to stay with the levels we used to have at ISMLP: composer or author, but also editor (that means a general © indication), AND piece (this is always particular). At each level, a field
for each country (UNO doesn't have more than 192 members!) saying:
[© status] because [reason(s), from a country-specific pre-set list] ; PD there in [Year, but also month & day, because it's not always Jan. 1st]
I don't think this would be a so enormous work, because it can be automatized: if the death fields of both composer/author/editor are correctly filled AND if the edition date also, the system can sort which score is under +50, +70, +80 or whatever (+100 in France for very few composers 'Morts pour la France'), AND if it is USA:Pre-1923, France:Pre-1921 and/or France:Pre-1948, etc.
Then the only things to be really handmade are: if a Post-1923 score is PD in the US because of © non-renewal, or if it is PD in this and this country because of a governmental publisher (this does not work in the EU. Maybe this task could also be automatized if special reviewers let the system know that this publisher of this country is considered PD in these, when publication date is from that year to that one).
Don't forget that we have a system with "reverse exceptions":
At the composer level, the work is PD unless protected according to the delays; then
- if protected, it is protected unless Pre-1923, non-renewal, or governmental rules apply;
- if PD, it's PD unless edition protection apply.
And each level with different rules for each country!
This is why I think a one-level tag won't work.
The main thing to do is to set up the sorting system, with specialists helping implementing their country's laws.
Of course, for some countries (but, I hope, none of the Western world, where most owners, publishers, and users are) we won't have at first the very precise rules (like new Taleban ban of music etc...), and there'll be mistakes; but with help of contributors, and of © holders knowing how to report their concerns properly, they'll be corrected as quick as possible.
This task seems to me more important than wasting time and money thinking of IP filtering, which is both morally and legally not indispensable.