list - only list files or directories in the depot without permission of 'get latest revision'.
review/read - can get latest revision of project in the depot without permission of 'check out', 'mark for delete' and 'mark for add' any files.
open - can 'check out', 'mark for delete' and 'mark for add' files in the depot without permission of 'submit' any files.
write - can 'submit' any files.