It has been proposed on Swedish Wiktionary to use a significant amount of material from a dictionary [1] which allegedly is out of copyright due to only having been protected under the law of "katalogskydd" ('catalogue protection') which is in effect for 15 years after publication. The last edition was published in 1989, the author died in 1986, and the last reprinting was done in 1999 -- though mere reprints are not supposed to grant extensions of the time of protection.
Assuming that the assessment about the material falling under the "katalogskydd" is correct, is that sufficient for WMF to be comfortable hosting the material, or does US copyright law interfere in any way?
\Mike
(cc-ing to Wiktionary-l to see if anyone there has experience with this particular situation.)