The terms of agreement for accessing the Amazon.com Web Services require all images pulled from the service to be linked back to Amazon.com, as well as an additional link. The Amazon.com associate's ID is included, too.
Amazon.com has changed their data API to require that all searches be signed with a secret key, unique to each user. Tellico 2.0 for KDE4 supports the new method. However, most older versions (i.e. all versions of Tellico prior to 1.3.6) do not.
A quick backport of the fix was made for Tellico 1.3.6 for KDE3. Most distributions probably won't package it, since they've moved on to KDE4. Find it on the Download Page.