I know that literature is considered public after 70 years (see Gutenberg’s project etc.) but what about music and cinema, and other forms of media?
The duration of copyright of literature, music and cinema depends on the local law in each country and on many other factors such as whether a work is published or unpublished. In most countries the copyright length of most of the works is the lifetime of the author plus 50 or 70 years and then its work is in the public domain. But, for example, in Italy and France there are wartime extensions that could increase the term by 6-14 years, and in Spain some works are covered by copyright in for 80 years after the author's death.
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you can get the offical answer to this question from LIBRAIRY OF CONGRESS.COM/COPYRIGHTS ...the site includes applications/rules and regulations/ etc.
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