→ moving the credit link to a faq/credits/etc page is fine, and as long as you keep the 'H' icon in the corner (on the themes that have it) you can delete the 'theme' link all together. However, do not remove the text in the source code.
Do not use my themes as bases
→ my themes aren't bases, so don't use them as such. You can always ask me to code you a base though, and I'll try to get it done for you. Alternatively, here are some base codes you can use
Do not redistribute my themes or claim them as your own.
→ Just please use common sense on this one. Don't steal, it's not nice.
I really don't mind if you edit my themes; I actually think it's cool to check out people's blogs and see how they're using a theme of mine. But yeah, just follow these rules & we'll be cool. :)