
Image: Shutterstock (AI assisted)
Of course there are many mainstream copyright issues to write about, notably the whole issue of how copyright and AI intersect–and the ongoing dialectic between them–but to mark Canadian Thanksgiving weekend and Columbus Day (or Indigenous Peoples Day, if you prefer) in the US, I have allowed myself the indulgence of probing an obscure corner of copyright lore. I’m going down the copyright rabbit hole to explore the Rule of the Shorter Term, and its implications. Be warned, if you don’t want to know why Steamboat Willie is protected under copyright for longer in Germany than in the US, move on now. But if this sort of minutiae intrigues you, as it does me, read on.
As I commented in my book, “In Defence of Copyright”, copyright as a concept is simple and straightforward—but its application can be fiendishly complicated. This is because of differing national legal frameworks regarding what is copyright protected—and for how long—and what is not. As most of us know, copyright is governed by an international convention, the Berne Convention of 1886, updated on numerous occasions, with its main provisions now incorporated into the rules governing the World Trade Organization (WTO). The Convention provides common minimum standards and rules, but each country is sovereign when it comes to determining how those provisions are to be applied. Add to this different copyright rules in place over the years, especially in the United States, and you get some very deep rabbit holes to explore. One of these involves the “Rule of the Shorter Term”, which I will shorten to RST.
This rule, which dates to the earliest days of Berne, is an exception to Berne’s national treatment provisions. One of the basic principles of Berne, apart from the requirement that member states acknowledge copyright without any formal registration requirements, is national treatment. This means that an author from Berne member Country A should receive the same treatment in Berne member Country B as do nationals of Country B in their home jurisdiction. For example, works of Canadian authors should receive the same protection in the US that US works enjoy. By the same token, under the principle of national treatment, US authors in Canada receive the same protection as Canadian authors do, which may be different from the standard applied in the US.
National treatment is a common standard and is one of the basic principles embedded into most international trade agreements. To ensure there aren’t major discrepancies in protection, all Berne members are expected to meet the minimum standards of the Convention, as amended over the years, including (for most works) a term of copyright protection lasting for the life of the author plus an additional fifty years. While all Berne members apply this basic standard, some go beyond it, offering a term of protection that is longer. This is the case of the EU, the US, UK, Australia, and since the end of 2022, Canada.
However, not all Berne members offer this additional period of protection. This is where the Rule of the Shorter Term (RST) comes into play. It allows Berne members to apply, as a derogation from national treatment, reciprocal treatment with respect to the additional period of protection beyond the required minimum. When the RST is applied, authors of foreign works are denied the benefit of the extra period of copyright protection if their home jurisdiction does not offer protection of a similar duration. So, for example, during the years when the period of protection in Canada for all works, foreign and Canadian, was the life of the author plus 50 years, Canadian rightsholders in the EU only enjoyed a comparable period of protection (i.e. “life + 50”) in EU member states, notwithstanding the fact that EU authors enjoyed a period of protection that was 20 years longer in their home jurisdiction. Because the US, since 1998, also bases its period of protection for current works on life + 70, US rightsholders enjoy the same protection in EU member states as domestic EU rightsholders. In fact, a primary motivation for the extension of the US copyright term twenty-five or more years ago (as I wrote about here) was to ensure that US rightsholders received equivalent protection in the EU to that enjoyed by their EU counterparts.
One of the arguments cited for Canada adopting a longer term was that Canadian rightsholders would also enjoy the longer copyright term of “life + 70” in countries that apply the RST (like EU member states), bringing potential additional economic returns to Canadian creators and industries. The US, by contrast, does not apply the RST. It accords the longer term of protection for all works, regardless of what the home country of the author does. As for Canada, stay tuned. I am saving that for a subsequent blog post.
You can look at the RST from two perspectives. One is to view it as lengthening copyright protection in certain circumstances (Canadian works now enjoy longer protection in EU countries); the other is to shorten it (Canadian works received a shorter period of protection in EU countries when Canada itself had a shorter term). It all depends on your point of view. One result of applying the RST is that when a work has fallen into the public domain in its country of origin because its (shorter) term of protection has expired, it will no longer be protected in the second country that has a longer term. So, for example, if a work entered the public domain in Canada as a result of a shorter copyright term, it would also be in the public domain in the EU notwithstanding the longer term applicable in the EU. Clear? I hope so.
As noted above, the EU explicitly applies the RST. However its application by EU member states is subject to some limitations. Even though the RST rule generally applies, it can be overridden by other considerations, such as bilateral treaty obligations. I wasn’t aware of this until I stumbled across a blog post written by a German copyright professor on the inexhaustible topic of Steamboat Willie entering the public domain. According to Dr. Lukas Mezger, while Willie entered the public domain in the US on January 1 of 2024, he will be protected in Germany for many more years. This is contrary to what I wrote in a an earlier blog post. Mea culpa.
That post discussed copyright differences between Canada and the US, one of them being when works enter the public domain. Disney’s Steamboat Willie was one example. Willie, as was widely trumpeted in the media, entered the US public domain on January 1, 2024, but in fact had become a public domain property in Canada two years earlier. This was well documented in a blog by Donald Taylor, copyright officer at Simon Fraser University.
After explaining how and why Steamboat Willie had fallen into the public domain in Canada on January 1, 2022, (the reason being because Canada’s term at that time was based on the life of the author plus 50 years, and co-author Ub Iwerks–who outlived his co-author Walt Disney by five years–had died in July, 1971), Taylor added that in Germany, which has a term of life + 70, the copyright would not normally expire until 2042. However, he added the caveat that because of the Rule of the Shorter Term, Germany would follow the practice of the home country and let Willie fall into the public domain on the same date as applied in the US, January 1, 2024. But Mezger’s blog (How Mickey Mouse entered the Public Domain in 2024 – but not in Germany) sees it differently.
His argument is that the RST is subordinate to bilateral treaties, such as the 1892 Copyright Treaty between the then German Empire and the United States. That treaty gives US works national treatment in Germany, and vice versa. After the passage of the 1891 Chace Act which offered copyright protection in the United States to works of non-US citizens subject to certain conditions like registering and printing in the US, the United States signed a number of bilateral treaties that guaranteed reciprocal national treatment. So, Steamboat Willie is protected under German law until at least 2042, or possibly later depending on who qualifies as a joint author, based on the German rule of life plus 70 years, according to Mezger. There is relatively recent legal precedent (2006) for the continued application of the 1892 treaty, limiting the applicaton of the Rule of the Shorter Term when applied to US works in Germany.
This copyright trivia as to how long a work is protected in one country versus another, and whether the Rule of the Shorter Term applies, has actual practical consequences. In one well researched case, a publisher of public domain books in the US, Devault-Graves, sought to republish three of J.D. Salinger’s lesser-known essays that had fallen into the public domain in the US. This had occurred because Salinger had neglected to renew the initial 28-year term of US copyright that prevailed at the time (the 1940s). Instead of enjoying a further 28 years of protection from date of publication, the works had inadvertently fallen into the public domain.
The Salinger Estate (Salinger died in 2010) went to court in 2015 to try to stop the republishers, but finally conceded that the essays in question were indeed in the US public domain. Having secured victory in the US, Devault-Graves decided that if the works were in the public domain in the United States, under the Rule of the Shorter Term they must be in the public domain in a number of other countries (i.e. those applying RST rules). They selected Germany as their test case–an unfortunate choice for them–and sought a publisher there. The Salinger Estate opposed. A German court dismissed the Devault-Graves claim that the RST applied in Germany to the works in question, based on the 1892 bilateral treaty. The three Salinger essays remain protected in that country.
Apart from the inconvenient existence of the 1892 German-US Copyright Treaty that limits whether the Rule of the Shorter Term is applied to US works in Germany, there is another widely accepted “convention” referred to as “potential term” that can also affect the period of protection for US works abroad. Although it does not formally exist in the Berne Convention, it is a further limitation on the application of the RST to US works. Potential term refers to the full term of protection that a work would receive under Berne’s “life + 50” principle, absent any formalities. One of the basic tenets of the Berne Convention is that copyright should be granted without any formality, such as registration. Until the revision of the US Copyright Act in 1976, the United States required formal registration to establish copyright, plus also required a formal renewal within a strict time limit in order to access the permitted 28-year extension.
Before the registration requirement was eliminated, many copyrights in the US lapsed due to the low renewal rate. Others lost copyright because of some technicality involving registration. For example, if the © mark, plus year, was printed on the jacket of a book rather than inside the book, a copyright registration would fail. Given that Salinger’s loss of copyright in his three essays was the result of a technical oversight involving failure to renew, under the “potential term” concept, copyright protection should not be lost as a result of faulty registration; it should last (in Berne Convention countries other than the US) until the year 2060, 50 years after Salinger’s demise and for a futher twenty years after that for countries that apply the “life plus 70” rule, (assuming the longer period of protection was in effect in those countries in 2010, the year that Salinger died).
The irrelevance of US copyright cancellations regarding limits on the protection of US works abroad was confirmed in an exchange of letters between the US Commissioner of Patents, Robert Stoll, and the Deputy Director General of WIPO, Shozo Uemera in 1989 when the US joined Berne. The Rule of the Shorter Term (RST) would not apply in other Berne signatory countries when US copyrights were denied or truncated on the basis of fault or negligence in registration. That principle was upheld by a French court in 2009.
So there it is, a tramp through the copyright weeds. If you are a real glutton for punishment, and want to drill down further, I recommend “International Copyright: The Introduction”, by Paul Edward Geller. It is “only” 230 pages long.
Now, what about Canada and the RST? That will be the subject of a future blog.
© Hugh Stephens, 2026. All Rights Reserved.









