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In Canada software is protected as a literary work under the Copyright Act of Canada. Copyright is acquired automatically when an original work is generated, the creator is not required to register or mark the work with the copyright symbol in order to be protected.
It varies from country to country. In the US it is Title 17 of the US Code, and in Canada it is the Copyright Act 1985.
The Copyright Act 1957 is an outdated Indian copyright law. The current revision is the Copyright Act 1999.
The 1997 Copyright Act of Canada.
The Copyright Act 1965 is an outdated UK copyright law; the current law is the Copyright Designs and Patents Act 1988.