/usr/include/xsec/utils/ is in libxml-security-c-dev 1.6.1-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xsec/utils/XSECAutoPtr.hpp
/usr/include/xsec/utils/XSECBinTXFMInputStream.hpp
/usr/include/xsec/utils/XSECDOMUtils.hpp
/usr/include/xsec/utils/XSECNameSpaceExpander.hpp
/usr/include/xsec/utils/XSECPlatformUtils.hpp
/usr/include/xsec/utils/XSECSOAPRequestor.hpp
/usr/include/xsec/utils/XSECSOAPRequestorSimple.hpp
/usr/include/xsec/utils/XSECSafeBuffer.hpp
/usr/include/xsec/utils/XSECSafeBufferFormatter.hpp
/usr/include/xsec/utils/XSECTXFMInputSource.hpp
/usr/include/xsec/utils/XSECXPathNodeList.hpp
/usr/include/xsec/utils/unixutils/
/usr/include/xsec/utils/unixutils/XSECBinHTTPURIInputStream.hpp
/usr/include/xsec/utils/unixutils/XSECURIResolverGenericUnix.hpp