How to publish a private Beta Android App in the market? [closed]

Question

In this video from Google I/O 2011, Google says you can use the Android Market for public and private Betas, how do you achieve a private Beta using the Market? Is there a way to make an App private? Because I cant find it.

http://youtu.be/twmuBbC_oB8?t=11m28s

Answer 1

you can make it private with a password lock on startup for example, or with an authentication system. (like google+ launch)

though be carefull with that because some users might not understand and downrate the app, so you need to state it in the description.