Yawcam -> Settings -> Password
It is possible to add password protection on the stream output. Select the checkbox to activate it.
The "Clear" button removes all the users and their passwords in the list.
The "Delete" button deletes the selected user in the list.
The "Add" button opens a dialog where you can add a new user:
Enter the username and after that the same password twice before clicking the "Add" button.
When password protection is activated the stream page will ask for a username and password like this: