What should be the standard of originality with respect to the derivative works (here, the copy-edited version of supreme court judgments) to make the work eligible to be called the author's original work and hence get protection under the Copyright Act of 1957?
The originality which is required relates to the expression of the thought.
A derivative work to receive copyright protection, it must be demonstrated that the derivative work is more than just a copy of the original and must contain the author's independent skill apart from capital and labour, which is not negligible or trivial.