1) The
nature of the copyrighted work. If the work in
question is factual (a history of WWII, for example), then
it is harder to prove infringement than if the work is one
of fiction.
2) How has the use of the new
material affected the marketability of the copyrighted
work? If the original work has lost much of its value
due to the new material, then infringement can be more
easily proven.
3) How much of the original work was
infringed upon? In other words, how much of the
copyrighted material was quoted in the new material?
The entire piece or just a portion?
4) The reason for the use of the new
material. Was it for non-profit or teaching, or was
it for commercial use?
If someone has infringed upon your
copyrighted work, you need to talk to an experienced,
reputable attorney as soon as possible to stop the
infringement. In most cases, you can sue for
damages.
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