If the use of a copyright work does not involve using
a substantial part, then there will be no
copyright infringement. What constitutes a “substantial part” is determined on a case
by case
basis and there are no set guidelines. In some cases a very small part of a copyright work (such
as a summary, the headline, a list of recommendations or the concluding remark) will constitute a
“substantial part”. Also, illustrations and graphs are considered to be separate works
to the text of
an article, chapter or book. For larger texts a rule of thumb often cited is no more than 800
words
in total extracts with no single extract from the work exceeding 300 words. For poems, 40 lines
is
cited as a good rule of thumb, provided that does not constitute more than 25% of the poem.
