No offense intended,
Nothing and no one can prevent text in an HTML-based web page to be copied
and pasted to another editor, unless they are incorporated into other forms,
such as an image or flash file.
However, word processing documents and web pages are known to contain hidden
codes (to retain formats and styles, for example), so one might experience
compatibility problem when trying to copy and paste text between different
editors or from/to a web page.
Judging by the sequence of C.B.'s posts, my guess is that C.B. composed the
first post using a word processor (or editor), and he had a problem trying
to copy and paste to a Web-based form (MS forum), but he could copy and
paste to Notepad.
I don't know the exact problem, but using ANSI encoding as suggested,
usually can eliminate compatibility issues associated with hidden codes, but
of course, removes formats and styles as well.
Just my two cents.