1tessAnyone can copy anything you post: pictures, text, audio.
Here are some links to read:
http://en.support.wordpress.com/prevent-content-theft/
http://en.support.wordpress.com/content-theft-what-to-do/
http://automattic.com/dmca/
If you plan to use the sign-in contact form information, you must be clear to the reader that you will use their email address to send them more information.
For my work blog, I have a check box for this question: "Would you like to receive an occasional newsletter [ ]yes [ ]no"
