Insomnia Turtle
Geocities does not claim copyright of anything other than the space you put your stuff on. They do, however, have the right to use whatever you put in your site (edit: what I should actually have said is "whatever you upload into their file manager, whether you use it in your site or just have it in there for storage)for their own promotional purposes without needing your permission (as you give them that permission when you sign up for an account) and without having to compensate you in any way beyond putting your name on your work.