Practice point:  The CPLR establishes three categories of protected materials: (1) privileged matter, absolutely immune
 from discovery, pursuant to CPLR 3101[b]; (2) an attorney's work product, also absolutely
 immune, pursuant to CPLR 3101[c]; and (3) trial preparation materials, which are 
subject to disclosure only on a showing of substantial need and undue 
hardship in obtaining the substantial equivalent of the materials by 
other means, pursuant to CPLR 3101 [d][2].  As to each category, the protection is supported by policy considerations.
Student note:  The burden of establishing a right to 
protection is on the party asserting it. The protection claimed will be 
narrowly construed, and its application must be consistent with the 
purposes underlying the immunity.
Case:  Venture v. Preferred Mut. Ins. Co., NY Slip Op 06594 (1st Dep't September 26, 2017)
Here is the decision.