ex: GET http://log.os/{{CIK_NUM}}/100/100 returns a 100x100 px logo for company matching {{CIK_NUM}}
If not, am I the only one interested in having one?
Funny thing about trademarks, I can go take a photograph of the Pepsi logo and then if they use it without permission I can sue them!
While a company's logo may be under trademark or simply copyright protection, you still have a legal "Fair Use" right to use the logo for the purpose of identifying or describing the company.
Most often, this is what logos are used for on a site. For example, "As Seen On... TC, CNN, blah blah blah". They obviously cannot be used to mislead someone into thinking the company is tied to or endorses your site.
Here's an article about it: http://smallbusiness.chron.com/fair-use-logos-2152.html