Bukkit

Update:

AmkMcAuth-se is Minecraft Vs. 1.15+ and 1.16+ ready. Works out of the box!

Preface: 

AmkMcAuth-se (Small-server Edition) is a fork/continued RoyalAuth plugin (developed by jkcclemens). Jkcclemens is not updating his plugin anymore, it seems to be an abandoned project. I'm very sad about that, RoyalAuth was a good plugin, i used it for years without any problems, but it stopped working at MC-Version 1.9+. 

So i took the original sourcecode from jkcclemens and i fixed all the errors that occurred using it on MC 1.9+ servers creating a new version that i named AmkMcAuth(se).

But, all the credits go to jkcclemens who is the original creator of RoyalAuth i am using as the base for this plugin.

AmkMcAuth(se) is the Small-server Edition of the (Big-Server) version AmkMcAuth. AmkMcAuth(se) is special made for Small-servers. The (Big-Server) AmkMcAuth version contains also Email-Registration and MySQL support (having a larger filesize).
So, if you have a small server or have a small playerbase then this is the version (se) you can use.
If you have a big server and/or you need MySQL support or Email registration, than you need the "Big-Server" version. 

It uses bStats.org for statistics, so i can see on how many servers it is running.

This version bug fixes, optimizations and new functionality. See the Changelog to find out the details.

This Plugin gives your (offline-mode?) MineCraft server a Login UserId+Password for the players upon entering your Server.  All this plugin will do is add the need to type in a password on the server. This prevents people that share a computer from using each other's account, etc. So you, as the adminisrator, can control who accesses your MineCraft server.

AmkMcAuth(se) is a lightweight, simple, easy-to-use authentication plugin. It requires players to register their account with a password and use that password to login, adding another layer of security to any server.

What options has the AmkMcAuth plugin.

See the config.yml AmkMcAuth config.yml file in the Pages section. This file also has all the options documented. 

Install+Setup:

Just drop the plugin in your plugins folder and (re)start the server.

AmkMcAuth works default "out of the box", no special configuration needed, meaning: your players need to register a password (first time) and log in using that password.

Using the Admin commands you can manualy manage players. 

Upgrade from older version to current version of AmkMcAuth?

You can just drop the plugin in your plugins folder and (re)start the server, but you have te check your existing config.yml and lang/en_us.properties files as there may be missing some entries (check the pages section for details) and you probably have to restart your server when you did some updates to those files.
As of version 1.3.4 AmkMcAuth updates your config.yml in place if it finds missing config settings after backing up your previous config.yml file (this removes the comment lines from the config file).
If you are updating to an older version (pre 1.3.4) you have to rename your config.yml manualy, start the server and merge the old and new config.yml files.

Commands and Permissions:

See the Command and Permissons files in the Pages section. 

SourceCode and Downloads:

The sourcecode can be viewed on github

Metrics:

AmkMcAuth uses bstats.org for collecting anonymous plugin stats:

• Total number of Servers running this plugin
• Total numer of players playing on servers
• Server Online/offline mode
• Mincraft server version
• Plugin version
• Server Core count
• System architecture
• Operating system
• Server location (country)
• Installed Java version
• AmkMcAuth Registered player count%100
• Plugin usage (Options used) 

Review/Usage

If you see something weird to happen or you want something added, please let me know so i can help you. Also: if you use this plugin, please let me know and leave a 'like', much appreciated. You might even send me some buck's (Donate) so i can enjoy a beer while updating this plugin :D .