The earliest known use of the script is attested by inscribed copper plates which have been dated to the early C11th. The language spoken in Bali at that time was heavily influenced by Old Javanese, and was substantially removed from modern spoken Balinese. The literary language from that period is still used in the context of traditional rituals, courts of law and liturgy; as a result the Balinese script has become associated with the same, and modern Balinese is often written in the Latin script. The Balinese script is taught in schools, however the extent to which a school or even the Balinese teachers themselves are willing to invest in teaching it can be small in comparison to investments in teaching English or Indonesian. There is some evidence of a trend amongst young Balinese in the North of the island to revive the script in an effort to reestablish their ethnic identity.
Juniartha, I Wayan. 2006. "Traditional Balinese Script Alive and Well in Singaraja" in The Jakarta Post, 31 August 2006, at http://www.baliblog.com/travel-tips/traditional-balinese-script-alive-and-well-in-singaraja.html