In what instances can a certified copy of a trademark registration be used?

A certified copy of a trademark registration is specifically used in legal proceedings and international filings, which makes this the correct answer. In legal contexts, such as when enforcing trademark rights or defending against infringement claims, a certified copy acts as official documentation that verifies the ownership and status of the trademark, bolstering the legal arguments being presented.

Furthermore, when filing for trademark protection in other countries, many jurisdictions require proof of existing trademark rights, and a certified copy serves as sufficient evidence of the registration. This functionality is essential for trademark owners wishing to protect their intellectual property across borders, as different countries often necessitate an official confirmation of established rights.

The other options do not accurately represent the primary and legally recognized uses of a certified copy. While marketing activities might benefit from the trademark status, a certified copy is not officially needed solely for promotional purposes, nor is it limited to internal record-keeping, which does not require certified documentation. Additionally, using a certified copy specifically for the registration of new trademarks is not appropriate, as it serves as proof of existing trademarks rather than to register new ones.