The Placement Opportunity Information Service (POIS) provides an interface to a repository of descriptions of opportunities for placement of content within an audio/video stream. Frequently these specify opportunities for insertion of advertising content within entertainment programming. The POIS may also contain attributes and constraints for each placement opportunity, platform compliance, rights, and policies of the content in which the placement opportunity exists. These placement opportunities are content specific; therefore, attributes and constraints may vary by network, geographic region, or other content distribution dimension.