Here in Canada, under the Copyright Act R.S.C., 1985, c. C-42, all works including technical works such as architectural plans or, in this case, software documentation and the discussions thereof, are copyrighted, the operant terms:
5 (1) Subject to this Act, copyright shall subsist in Canada, for the term hereinafter mentioned, in every original literary, dramatic, musical and artistic work if any one of the following conditions is met:
(a) in the case of any work, whether published or unpublished, including a cinematographic work, the author was, at the date of the making of the work, a citizen or subject of, or a person ordinarily resident in, a treaty country;
(b) in the case of a cinematographic work, whether published or unpublished, the maker, at the date of the making of the cinematographic work,
(i) if a corporation, had its headquarters in a treaty country, or
(ii) if a natural person, was a citizen or subject of, or a person ordinarily resident in, a treaty country; or
(c) in the case of a published work, including a cinematographic work,
(i) in relation to subparagraph 2.2(1)(a)(i), the first publication in such a quantity as to satisfy the reasonable demands of the public, having regard to the nature of the work, occurred in a treaty country, or
(ii) in relation to subparagraph 2.2(1)(a)(ii) or (iii), the first publication occurred in a treaty country.
The USA congress position on this was published above, which is reflective of their own legislation.