Copyright Licensing

One of the more comprehensive resources I've found for all sorts of copyright information resides in an article by Therese A. Clarke Arado on the LLRX.com website. Copyright and Licensing Digital Materials - A Resource Guide lists a whole slew of music issues and resources, motion picture and television, and web-based and blog rights. From the latter, she warns:

If you have found images or clips on the web that you wish to incorporate into your own web page or a presentation you still need to obtain permission. As we all know, just because it is available on the web it is not free to use at any time. Hopefully, the web page has contact information provided. In order to obtain permission you want to contact the author and provide a written description of what you would like to use and how you plan to use it (e.g. in a presentation, on another web page etc.). If an author of the site is not easily discernible contacting the page's Webmaster is your next alternative. It is possible that a third party owns the material used, at the site you are viewing, and permission was obtained to use it. If that is the case you will have to go to the original owner in order to seek proper permission.

Does the quote above violate a copyright? [copyright]