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2. MP3 - Wikipedia

   en.wikipedia.org/wiki/MP3

   The basic MP3 decoding and encoding technology is patent-free in the European Union, all patents having expired there by 2012 at the latest. In the United States, the technology became substantially patent-free on 16 April 2017 (see below). MP3 patents expired in the US between 2007 and 2017.

3. Portable media player - Wikipedia

   en.wikipedia.org/wiki/Portable_media_player

   Some MP3 players can encode directly to MP3 or other digital audio formats directly from a line-level audio signal (radio, voice, etc.). [citation needed] Devices such as CD players can be connected to the MP3 player (using the USB port) in order to directly play music from the memory of the player without the use of a computer. [citation needed]

4. List of online music databases - Wikipedia

   en.wikipedia.org/wiki/List_of_online_music_databases

   AllMusic. Music information and reviews. ~20,000,000 [7] ~2,200,000 [7] Song samples only. Discogs. • Database: user-generated cross-referenced database of physical & digital releases, artists, and labels. With catalogue numbers, codes, and other markings taken directly from each release.

5. SanDisk portable media players - Wikipedia

   en.wikipedia.org/wiki/SanDisk_portable_media_players

   The SanDisk SDMX1 series (including the SDMX1-1024, −512, and −256—reflecting capacity in MB), also known as the SanDisk Digital Audio Player, is a low-end solid state memory MP3 player. It was SanDisk's first personal media player, and the only one of its time not to be sold under the Sansa brand. It supports MP3, WMA, and DRM -protected ...

6. Music download - Wikipedia

   en.wikipedia.org/wiki/Music_download

   Music download. A music download (commonly referred to as a digital download) is the digital transfer of music via the Internet into a device capable of decoding and playing it, such as a personal computer, portable media player, MP3 player or smartphone. This term encompasses both legal downloads and downloads of copyrighted material without ...

7. Comparison of digital music stores - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_digital...

   Digital music stores sell copies of digital audio, for example in MP3 and WAV file formats. Unlike music streaming services, which typically charge a monthly subscription fee to stream digital audio, digital music stores download songs to the customer's hard disk drive of their device.