We just got sued by a patent troll because they found our logo on the site of a software company they claim infringed. As a customer [at some point -- this was

We just got sued by a patent troll because they found our logo on the site of a software company they claim infringed. As a customer [at some point -- this was >10 years ago], and without proof our contract indemnified us from such things, it was perfectly reasonable for them to do so. So yes, adding logos of companies as endorsers when they are really just individuals participating is disingenuous and could get you black-balled by any company that realizes it's happening. You should at least ask permission first.