FreeBSD Advertising clause

[Enrico Venezia]

Hello,

I'm Enrico Venezia, I come across in FreeBSD.

I thought it's fantastic! I have only to mention the University of
California for my project!

"3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of California,
Berkeley and its contributors."

While I was working on the source code, I discovered that many other files
was licensed by other authors.

Thare are about 300 files with this sentence "This product includes
software developed by <different name from University of California,
Berkeley>".

So my questions are (and I hope that you can help me):

- What mean advertising materials? Do I have to put 300 different sentences
in every page of my website, manual pages, etc?
- The 4-clause of the license says: "Neither the name of <name> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.". It
is a violation of the clause writing "This product includes software
developed by <name>"? I mean, can I write this sentence without specific
prior writter permission from the author?
- Does the main COPYRIGHT file overwrite other author licenses?

Thanks