ownership

The state of having complete legal control of something; possession; proprietorship.

Other evidence of former ownerships such as notice-boards, number plates, and makers' plates, are often discovered unexpectedly. […] It has not been used for many years, and although it was impracticable to photograph the engine in the small confines of the shed it was possible to obtain a picture of the plate which it still carries showing the former ownership.

In the summer, DCC [Devon County Council] transferred ownership of the northern part of the station to NR for a nominal £1, enabling it (and the platform) to become part of the rail network.

Responsibility for or control over something.

The successful candidate will take ownership of all internal design projects.