I didn't consult with a lawyer or something... each company and their "branding" rules for API users and most allow to use the logo under certain restrictions t

I didn't consult with a lawyer or something... each company and their "branding" rules for API users and most allow to use the logo under certain restrictions that to my best understanding I don't break. Dropbox for instance had to approve the app before I could use the API and I bet they had a look at the website beforehand.