Copyright questions that pertain to works created in other countries are notoriously difficult to research. This is largely due to the fact that each country has different laws and in some cases different languages.
In an effort to provide some clarity, many countries have joined the Berne Convention for the Protection of Literary and Artistic Works. The Berne Convention was first adopted in 1886 as an agreement to honor the rights of all authors who are citizens of countries that have joined the convention.
The Berne Convention further states that the scope and limitations of any copyright are based upon the laws of the country where the misuse of the copyright-protected work takes place (rather than the country where the work originated). For example, if you photocopy an article in the U.S., then U.S. copyright law applies to determine whether that copy was lawful. Similarly, if you digitize an image in the UK, the copyright laws of the UK apply to determine whether that digitized use is lawful.
For a summary of the rights provided by the Berne Convention, please see the UK Copyright Service Fact Sheet.
If you plan to reproduce a significant portion of an author's work, your first step in any country is to locate the rights holder of the work in question and ask for permission. For additional information on this process, please see the Digital Media Law Project web site.
Before embarking on an international copyright permissions project, please consider these options:
Fair Use
Locate Alternatives
Rethink Your Intended Use