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How do you go about finding out if copyright on a book is expired?

The particular book I'm looking at is from 1923 published in Europe, I live in Canada.

Ideally I'd like a method to figure this out myself for other books. I've read that the answer depends on a few factors:

  1. Where it was published
  2. When it was published
  3. Does it has a copyright notice
  4. Was copyright notice renewed (?)
  5. Where the person using the book is (?)

Figuring out the first two aspects is obvious but I'm less clear on points 3 and 4 as well as determining whether the work is copyrighted still once I have all this information.

edit: Added point 5. Does where the person using the material matter? Or does enough countries agree on a common copyright policy in 2015 that this is irreverent?

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    It may or may not be irreverent, but it is certainly not irrelevant where the use takes place. Every country in the world other than one might agree on copyright rules that place the material in the public domain, but if you violate the copyright in that one country where it is not in the public domain, you can be liable for damages in that country. Also, copyright can exist without copyright notice. It sounds like you ought to read the Wikipedia article or a similar overview. – phoog Nov 19 '15 at 17:23
  • @phoog yes but I've read works published between 1923-1977 in the USA without a copyright notice are now public domain. So whether it has a notice seems to be important for older works. – Philip Kirkbride Nov 19 '15 at 20:41
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    Also, "Europe" is not a jurisdiction - it is a bunch of jurisdictions. – Dale M Nov 20 '15 at 0:46
  • This isn't a general method to determine copyright status, but you could look for a specific book on reputable open source book sites such as www.gutenberg.org. Maybe one of them has already done the research for you. – James Nov 20 '15 at 12:26
  • @PhilipK that's probably true; copyright notices used to have more meaning. – phoog Nov 20 '15 at 23:28
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As mentioned in the comments, there is no general method for this, but there are certainly good ways to get started.

Note that copyright status is determined on a country by country basis, so "the country" in this answer refers to one you are living in, in this case Canada.

First, there's a quick test to determine if a work is definitely copyright. Most countries have signed the Berne Convention which provides for copyright lasting a minimum of 50 years after the author's death for literary works. In general, it also provides that a country treat works published in other Berne countries as if it were published in its own, with respect to copyright. I'll call this the equality rule. So we have that:

  • If the country acceded to the Berne Convention before the publication date of the book and the author is still living, or died less than 50 years ago, the book is under copyright.

If the above did not apply, there are still steps you can take:

  • Look up the country's copyright term. Find the legislation that established the copyright term. If the country has changed copyright terms over the years, the legislation will often provide for how books published before term changes are to be treated with respect to the new legislation.
  • For Berne parties, does the country apply the rule of the shorter term? This is the main exception to the equality rule. The country may choose to use the country of origin's term instead of its own if it is shorter. If this is the case, then, you must read the country of origin's legislation with respect to copyright terms.
  • The vast majority of legislation introduced affecting copyright terms has served to increase its length. Thus, if you pretend that the current copyright term applied back when the book was published, and find that the book is no longer under copyright, you can almost always assume that is actually the case.

For an example of how complicated this can be, see this analysis on whether public domain works in the US are copyright in the UK. The UK has been a Berne party from the start, but has at times changed its term length, and whether or not it applies the rule of the shorter term. The US has only been a Berne party since 1989. Before this, they required copyright registration and didn't always base the copyright term on the author's death.

In general, the factors you mentioned have the following effect:

  1. For Berne parties (as of publication date), this is only relevant for those applying the rule of the shorter term.
  2. Important to know this date when reading copyright legislation, as the applicable term often depends on this.
  3. Mostly relevant to pre-Berne accession, especially in the US
  4. Same as 3.
  5. Important, to know what laws ultimately apply.
  6. An additional factor you usually need: date of author's death (longest living author in case of multiple authors), as the term is based on this for Berne parties.
  • I use "copyright term" in the singular, but its technically possible that different ones apply in different scenarios even for a constant date of publication. This is most likely when dealing with non-Berne countries. – DPenner1 Feb 27 '16 at 7:33
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    There can also be multiple copyrights applying to a work. If the work was originally written in one language and translated to another, the original author and the translator will have copyrights in the resultant work. – Martin Bonner supports Monica Mar 29 '16 at 12:49

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