/usr/include/rds/ is in librdsclient-dev 1.1.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/rds/client/
/usr/include/rds/client/RdsClient
/usr/include/rds/client/RdsDaemonManager
/usr/include/rds/client/RdsDhcpGroup
/usr/include/rds/client/RdsDhcpHost
/usr/include/rds/client/RdsDhcpManager
/usr/include/rds/client/RdsDhcpSharedNetwork
/usr/include/rds/client/RdsDhcpSubnet
/usr/include/rds/client/RdsDhcpValues
/usr/include/rds/client/RdsDnsManager
/usr/include/rds/client/RdsDnsZone
/usr/include/rds/client/RdsEntityManager
/usr/include/rds/client/RdsFileManager
/usr/include/rds/client/RdsLdapActions
/usr/include/rds/client/RdsLdapObject
/usr/include/rds/client/RdsLdapSession
/usr/include/rds/client/RdsMountPoint
/usr/include/rds/client/RdsMountPointManager
/usr/include/rds/client/RdsShare
/usr/include/rds/client/RdsShareManager
/usr/include/rds/client/RdsStorageDevice
/usr/include/rds/client/RdsStorageDeviceManager
/usr/include/rds/client/RdsVolume
/usr/include/rds/client/RdsVolumeManager
/usr/include/rds/client/rdsclient.h
/usr/include/rds/client/rdsdaemonmanager.h
/usr/include/rds/client/rdsdhcpgroup.h
/usr/include/rds/client/rdsdhcphost.h
/usr/include/rds/client/rdsdhcpmanager.h
/usr/include/rds/client/rdsdhcpsharednetwork.h
/usr/include/rds/client/rdsdhcpsubnet.h
/usr/include/rds/client/rdsdhcpvalues.h
/usr/include/rds/client/rdsdnsmanager.h
/usr/include/rds/client/rdsdnszone.h
/usr/include/rds/client/rdsentitymanager.h
/usr/include/rds/client/rdsfilemanager.h
/usr/include/rds/client/rdsldapactions.h
/usr/include/rds/client/rdsldapobject.h
/usr/include/rds/client/rdsldapsession.h
/usr/include/rds/client/rdsmountpoint.h
/usr/include/rds/client/rdsmountpointmanager.h
/usr/include/rds/client/rdsshare.h
/usr/include/rds/client/rdssharemanager.h
/usr/include/rds/client/rdsstoragedevice.h
/usr/include/rds/client/rdsstoragedevicemanager.h
/usr/include/rds/client/rdsvolume.h
/usr/include/rds/client/rdsvolumemanager.h