You can play with any account online without having their password

You can basically play with any account you want, online.
Type in any username you want and press login, its gonna tell you either the password is wrong and then you press "play offline" tada you can play.

Oh and btw...you can type in whatever you want to play. I tried "as23ygsdz4265" pressed login....and it worked,could play online.

http://i.imgur.com/OFLMeFV.png

TL;DR You can play minecraft without having ANY real account and or even use real accounts/getting their inventory