writes "Over the past few months Twitter imposed restrictions on the use of its client API, and Facebook shut down the facial recognition API supported the face.com after acquiring the company. Mathew Ingram noted these and other examples (Google starting to charge for high-volume use of Google Maps) as evidence that "open APIs" published by a single vendor can't be trusted by outside developers. Worried about the possibility that Yahoo! might do the same with Flickr, Dave Winer has just launched a petition to Obama asking the President to declare the Flickr API a National Historic Landmark, thus (by Dave's reckoning) legally protected from arbitrary withdrawal or wholesale changes by its corporate masters. As of this post, Dave's petition has gained 24 signees."