/usr/share/maven-repo/net/ is in libproguard-java 6.0.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/maven-repo/net/sf/
/usr/share/maven-repo/net/sf/proguard/
/usr/share/maven-repo/net/sf/proguard/proguard-base/
/usr/share/maven-repo/net/sf/proguard/proguard-base/6.0.1/
/usr/share/maven-repo/net/sf/proguard/proguard-base/6.0.1/proguard-base-6.0.1.jar
/usr/share/maven-repo/net/sf/proguard/proguard-base/6.0.1/proguard-base-6.0.1.pom
/usr/share/maven-repo/net/sf/proguard/proguard-base/debian/
/usr/share/maven-repo/net/sf/proguard/proguard-base/debian/proguard-base-debian.jar
/usr/share/maven-repo/net/sf/proguard/proguard-base/debian/proguard-base-debian.pom
/usr/share/maven-repo/net/sf/proguard/proguard-gradle/
/usr/share/maven-repo/net/sf/proguard/proguard-gradle/debian/
/usr/share/maven-repo/net/sf/proguard/proguard-gradle/debian/proguard-gradle-debian.pom
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/6.0.1/
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/6.0.1/proguard-retrace-6.0.1.jar
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/6.0.1/proguard-retrace-6.0.1.pom
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/debian/
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/debian/proguard-retrace-debian.jar
/usr/share/maven-repo/net/sf/proguard/proguard-retrace/debian/proguard-retrace-debian.pom