What is the purpose of digital watermarking in files?

Digital watermarking serves the purpose of embedding a small amount of information into files, such as images, audio, or video, without noticeably affecting the quality of the original content. This technique is particularly useful for copyright protection, allowing authors and creators to assert ownership of their work by embedding identifying information that can be detected but is not immediately obvious.

In the context of digital media, watermarking can include information such as the creator's name, copyright details, or even unique identifiers that track the use and distribution of the file. The information is carefully integrated into the file's content in such a way that it remains invisible to the average viewer or listener, ensuring that the user experience is not diminished. This capability makes watermarking an essential tool in protecting intellectual property rights in the digital landscape.

The other options suggest functions that are not aligned with the primary purpose of digital watermarking. For instance, compressing file sizes, improving graphics quality, or enhancing user experience do not directly relate to the intent behind watermarking, which is fundamentally about ownership and traceability of the digital content.