  Semantic communication is an emerging feature for future networks like 6G,
which emphasizes the meaning of the message in contrast to the traditional
approach where the meaning of the message is irrelevant. Yet, the open nature
of a wireless channel poses security risks for semantic communications. In this
paper, we derive information-theoretic limits for the secure transmission of
semantic source over wiretap channel. Under separate equivocation and
distortion conditions for semantics and observed data, we present the general
outer and inner bounds on the rate-distortion-equivocation region. We also
reduce the general region to a case of Gaussian source and channel and provide
numerical evaluations.
