/usr/ is in libdigidoc-dev 3.10.1.1208+ds1-2.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libdigidoc/
/usr/include/
/usr/include/libdigidoc/DigiDocCert.h
/usr/include/libdigidoc/DigiDocConfig.h
/usr/include/libdigidoc/DigiDocConvert.h
/usr/include/libdigidoc/DigiDocDebug.h
/usr/include/libdigidoc/DigiDocDefs.h
/usr/include/libdigidoc/DigiDocDfExtract.h
/usr/include/libdigidoc/DigiDocEnc.h
/usr/include/libdigidoc/DigiDocEncGen.h
/usr/include/libdigidoc/DigiDocEncSAXParser.h
/usr/include/libdigidoc/DigiDocError.h
/usr/include/libdigidoc/DigiDocGen.h
/usr/include/libdigidoc/DigiDocHTTP.h
/usr/include/libdigidoc/DigiDocLib.h
/usr/include/libdigidoc/DigiDocMem.h
/usr/include/libdigidoc/DigiDocOCSP.h
/usr/include/libdigidoc/DigiDocObj.h
/usr/include/libdigidoc/DigiDocParser.h
/usr/include/libdigidoc/DigiDocSAXParser.h
/usr/include/libdigidoc/DigiDocService.h
/usr/include/libdigidoc/DigiDocStack.h
/usr/include/libdigidoc/DigiDocVerify.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libdigidoc.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libdigidoc-dev/
/usr/share/doc/libdigidoc-dev/copyright
/usr/share/libdigidoc/
/usr/share/libdigidoc/TEST EECCRCA.crt
/usr/share/libdigidoc/TEST EID-SK 2011.crt
/usr/share/libdigidoc/TEST ESTEID-SK 2011.crt
/usr/share/libdigidoc/TEST Juur-SK.crt
/usr/share/libdigidoc/TEST KLASS3 2010.crt
/usr/share/libdigidoc/TEST SK OCSP 2011.crt
/usr/share/libdigidoc/TEST-SK OCSP 2005.crt
/usr/share/libdigidoc/TEST-SK.crt
/usr/lib/x86_64-linux-gnu/libdigidoc.so
/usr/share/doc/libdigidoc-dev/changelog.Debian.gz