security alert

I have a single slide with only one item in it. It contains the logo of a
potential customer captured from their website. When opening the Power Point
in 2007, a security warning states:

“References to external pictures have been blocked. If you choose to enable
the content, you may be loading content from remote locations, which presents
a security risk.”

Then farther down it states:
“Warning: This document references pictures in untrusted locations. These
references have been blocked.”

Does anyone know what might be going on with this graphic to generate this
security alert?

Thank you.

.

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