What is copyright infringement?

The U.S. Copyright Office provides this definition of copyright infringement:

As a general matter, copyright infringement occurs when a copyrighted work is reproduced, distributed, performed, publicly displayed, or made into a derivative work without the permission of the copyright owner.

Copyright in Vietnam

A copyrighted work is a literary, musical or artistic work that is fixed in a tangible medium (paper, canvas, computer file, audio or video recording, etc.). Such protection lasts for a limited period of time (in the United States, that period for works created after January 1, 1978, is the life of the author plus an additional 70 years). Protected works include poetry, novels, movies, songs, computer software, and architecture.

Copyright does not protect names, titles, slogans, short phrases, ideas, concepts, systems, or methods of doing something; however, these things may be protected as trademarks or patents.

ANT Lawyers - A Law firm in Vietnam is supported by a team of experienced patent, trademark, design attorneys with qualification and skills handling full range of legal services relating to intellectual property rights in Vietnam.  We have specialized in the preparation and registration of patents, trademarks and designs for our clients.

Source: Quora