Nope, it's too wishy-washy for you to judge the potential for violation in a forum post. The 4 criteria have to be interpreted with respect to the situation at hand, and hypotheticals are almost impossible to interpret rationally.
Republishing single sentences has previously been found to be a copyright violation, and copyright has been granted on as few as three notes. On the other hand (to pick a recent example), 50 Shades of Grey, originally written as a Twilight fan-fiction (derivative by definition) was never pursued for copyright violation (AFAIK).
Republishing single sentences has previously been found to be a copyright violation, and copyright has been granted on as few as three notes. On the other hand (to pick a recent example), 50 Shades of Grey, originally written as a Twilight fan-fiction (derivative by definition) was never pursued for copyright violation (AFAIK).