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The term “public domain” refers to creative materials that are not protected by intellectual property laws such as copyright, trademark, or patent laws. ... Anyone can use a public domain work without obtaining permission, but no one can ever own it.
Most email clients contain a "subject" that allows the user to read an email message without actually opening it.
A Pascal program basically consists of the following parts :
Program name, uses command, type declarations, constant declarations, variables declarations, functions declarations, procedures declarations, main program block, statements and Expressions within each block, and comments