Who owns the free themes on freethemesite.com ?
The owner of freethemesite.com has exclusive rights to these themes.

May I remove the footer backlink from the theme when I use it?
No! Maintaining the footer backlink on the theme is part of the license agreement.

May I change the layout of a theme?
Yes you may, but as long as you are using the image files, php files, .css file and color schemes of the theme, then you remain bound by the license agreement.

How many themes may I use?
You may use as many themes as you'd like.