Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found at [3]. Renewals for copyrights from 1951 onward (and some, but not all, renewals for 1950 copyrights), as well as original registrations from 1978 onward are available online from the Copyright Office's Copyright Records web site. The search of copyrights registrations and renewals showed no entries for the seal of the City of Pittsburgh, by or for the city itself. The seal was never copyrighted or the copyright of the seal was not renewed and therefore it is in the public domain according to either criteria.)
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
Dette biletet er sett saman av eit flagg, eit våpen, eit sigill eller eit anna offisielt insignium. Bruken av slike symbol er avgrensa i fleire land. Desse restriksjonane er uavhengige av den opphavsrettslege statusen.