Probably owing to the guitar's great popularity, but from nearly the same moment I first picked up the guitar I also became aware of its inherent value to thieves.  Back then,  the only security available was keeping it within line of sight. I personally never fell prey to any major losses due to theft, but that's not to say that I haven't been exposed either. Some friends of mine once had nearly their entire band's gear stolen from a supposedly secure practice space! For most musicians, the instrument, regardless of cost,  represents a major investment. Money, setup effort, a piece of the player's personal identity, are all things represented within that.  So how do you protect that?

This morning I spent about thirty minutes setting up an account with Instrument Life. www.instrumentlife.com
They're a local company based here in northern Kentucky, but they offer a world class service for protecting your instrument against theft. They provide a database for storing information about your instrument and an inexpensive tracking chip which can be installed secretly on the instrument itself!  And that's only the beginning the comprehensive list of ways available through them to either protect your instrument from theft, or assist you in recovering it. Check it out and see what you think.