/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/ is in libflexdock-java-doc 1.2.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/LayoutEvent.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/LayoutEventHandler.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/LayoutListener.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/PerspectiveEvent.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/PerspectiveEventHandler.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/PerspectiveListener.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/RegistrationEvent.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/RegistrationHandler.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/RegistrationListener.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/package-frame.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/package-summary.html
/usr/share/doc/libflexdock-java-doc/api/org/flexdock/perspective/event/package-tree.html