  The Stratonovich's value of information (VoI) is quantity that measure how
much inferential gain is obtained from a perturbed sample under information
leakage constraint. In this paper, we introduce a generalized VoI for a general
loss function and general information leakage. Then we derive an upper bound of
the generalized VoI. Moreover, for a classical loss function, we provide a
achievable condition of the upper bound which is weaker than that of in
previous studies. Since VoI can be viewed as a formulation of a privacy-utility
trade-off (PUT) problem, we provide an interpretation of the achievable
condition in the PUT context.
