[gambler]

Let's not call this a "standard" practice. In my experience, most companies do no make claims to your off-the-hours projects. And that is how it should be. Unless you're doing some cutting edge AI research or something of that sort, this kind of legal claim is just paranoid stupidity. Even if you do cutting edge AI research, it shouldn't entitle your employer to own a phpBB patch you've done in your free time.