Locks can be used to restrict a group's users.
Locking urls will auto-delete all messages with urls, locking stickers will delete all stickers, etc. Locking bots will stop non-admins from adding bots to the chat.
Possible locktypes are:
You can print this list by running
Printing the current settings
/locks will give you the current list of locks in this chat.
Locking and Unlocking
/lock <type> or
/unlock <type> with one type from the list of locktypes!