International copyrights have been protected at one time or another by:

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All of these options have been used to protect international copyrights at different times. The Berne Convention is an international treaty that sets the standards for the protection of literary and artistic works, GATT has included provisions for intellectual property protection, the US has signed bilateral treaties with individual countries, and the Universal Copyright Convention is another international treaty for the protection of literary and artistic works.

International Copyrights Have Been Protected at One Time or Another