I was asked to provide a quote for an image of a trademarked item, for editorial use (textbook + electronic version).  Being cautious, I answered informing that it was not my responsibility to verifiy if an authorization is required from the manufacturer, but that I could make a first contact with them and then let them negotiate directly.  It's a Brazilian manufacturer and a foreign publisher, thus my proposition of introducing them.

If the requestor replies he will do the contact himself, I plan to write in my invoice some note on this matter.  If I do the first contact, then the buyer says they hve reached an agreement, I would also write a note in the invoice.

Now I wonder... was I too careful, and should have simply sold the image with that note in my invoice?  I mean, I don't have to ask a driver's license from someone buying a car, do I?

I only hope the manufacturer doesn't offer his own press material to the buyer.