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How does a public standard stay “patented” for longer than 20 years?

<p>Dolby engages in legally dubious strategies known as “evergreening” to abuse the patent system and extend their licensing monopoly for AC-3. Some of these tactics include:</p> <ul><li> refusing to provide

What is Dolby Digital (AC-3)?

<p>AC-3 is a compressed digital audio format like MP3. It made its public debut in 1992. AC-3 has become the most common format for audio in film and television. </p> <ul><li>