Ask HN: How do you manage license keys in your software?

Welcome to the shareware registrars business! http://www.blackcatsystems.com/regservices/

Some of them have SDKs and can manage license keys.

Not sure about web & mobile, but on the desktop Armadillo was a big player: http://www.siliconrealms.com/ Armadillo would handle code generation / management, while e-commerce services with Armadillo support would handle the other half.

The downside of any common license system is that it becomes a big target for crackers, since cracking the one system unlocks lots of software. Some developers are happy to deal with that, others not.

If you're rolling your own, make sure you've checked out Brandon Staggs' article on Partial Key Verification (PKV): http://www.brandonstaggs.com/2007/07/26/implementing-a-parti...

There are quite a few companies that provide online activation service (just search for "software license management"), but the other features you list aren't as common. I think you'd need to spend some time Googling related phrases and do your own analysis to get a better feel for the market.

We've been trying to solve this problem for our software IgnitionDeck, and haven't yet had time to write our own tools for the job. I looked, unsuccessfully, but would certainly pay for a decent solution.