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The intent of copyright protection is to allow creators to ascribe value to their intellectual works.
Equipotentials cannot cross because they relate to places with a given value for potential. Lines of force meet at the charge or point of mass. They can cross if they relate to the same potential. Think of two mountain chains of unvarying height crossing each-other.
All art is subject to the copyright of the original artist anyway.
You can have it appraised by a specialist in that type of rights.
Modern copyright was intended to allow creators to ascribe value to their works through scarcity, with the assumption that this will encourage creation.
Copyright allows creators to ascribe value to their creativity, imagination, and hard work. In economics, this is known as the labor theory of value; in philosophy, it is linked to Locke's second treatise.
What is the value of longfellow's poems by Henry w. Longfellow
to pesuade other
The 1897 novel is in the public domain, so the copyright currently has no value. First editions of the novel, on the other hand, tend to be priced between $12,000 and $13,000.
Copyright protection gives creators the chance to ascribe value to (and perhaps derive income from) their creativity and hard work.
It encourages creativity by allowing creators to retain the value of their works.
The value would be based on the condition of the book and it it had any famous persons that signed it.