Locks on Streams
Each stream can have one or more locks on it. A lock prevents a certain set of users from using the stream to create new versions of elements. That is, it prevents execution of the Promote command — either promoting from the designated stream, or promoting to the designated stream, or promoting in either direction.
Locks can also prevent demoting from or to the designated stream as well as reconfiguration of the contents of a stream with the include/exclude facility.
A lock can be absolute, applying to all users. Alternatively, you can specify that a lock applies to a particular AccuRev user, or to a particular AccuRev group. Conversely, you can specify that a lock applies to everyone except a particular AccuRev user, or to everyone except a particular AccuRev group.
For more on locks, see lock in CLI Help.