This depends entirely on the source. Often, "Premium" implies it is paid content, but it may be available through subscription-based artistic platforms.
If your native operating system player fails to open the file due to a missing codec pack, several open-source alternatives can handle the playback smoothly:
What are you currently using to download files?
The "Premium" designation often signifies enhanced production value, higher resolution, and exclusive content not found in standard releases. Why Download This Specific File?