Simple software license key server suggestions?

Question

My boss wants a quick, simple to integrate, simple to host software licensing server to enforce license activations and expirations. We have to integrate it with a C++ Windows Service application.

I would not like to host the service in our office for the same reason we don't host our own website in our office. The service must be host-able in "the cloud" or at a normal web hosting company (for instance, a SOAP service that runs over HTTPS).

We would like a simple royalty-free solution. Any suggestions other than building our own?

Answer 1

Flexnet Publisher does what you want - not sure of pricing model though.

EDIT: Flexnet appear to be pricey and non-hosted. Try this thread for more options:

http://stackoverflow.com/questions/443064/alternatives-to-flexnet-publisher-reprise

Orion looks promising.