I don't know if this fits exactly in the "Rant" category, or if I should create a "Praise" one, because I'm not sure if I'm utterly amazed or disgusted, but this definitely gets my attention.
There's one addon for World of Warcraft called Carbonite, which made a controversy some time ago, because it wasn't free. It was even subscription-based, costing a couple of dollars a month to be able to use it. I've been wondering a long time how they were able to do a proper license check, but the addon itself was heavily obfuscated using several layers.
- The process had to be transparent for their subscribers, as they only had to log in with their registered character to unlock the addon;
- The process had to be limited in time;
- The process had to be strong and very difficult to circumvent.
Now, when Blizzard decided to release a new policy about addons, forbidding to sell or obfuscate addons, the people at Carbonite released their version 3.001 which was free and somehow unobfuscated. You may want to have a look at this old beast as it's still available for download at wowinterface, but allow me to show you what's interesting in it. Note that future versions of the addon got rid of what I'm going to show there.