The last few permanent contracts I've had have had a clause that said the company I was joining would own any work that I do inside or outside of office hours.

The last few permanent contracts I've had have had a clause that said the company I was joining would own any work that I do inside or outside of office hours. It's never specific as to what this work is, or who it's for. I've always made sure it's been changed to only work done in the office, unless it's a specific project for them that I'm doing at home. Moreso, I've always had it noted that some stuff I've written in my own time will be used for them at work. IANAL, I have no idea where my legal rights stand, but it made me feel a bit better, just in case. It's never been an issue, though.