Despite the efforts of philologists from all parts of the world, and despite the use of modern cryptographic analysis, the signs remain undeciphered. It is also unknown if they reflect proto-Dravidian or other non-Vedic language(s).
The Khmer alphabet is descended from the Brahmi script of ancient India by way of the Pallava script, which was used in southern India and South East Asia during the 5th and 6th Centuries AD. The oldest dated inscription in Khmer, found at Angkor Borei in Takev Province south of Phnom Penh, dates from 611 AD. The Khmer alphabet closely resembles the Thai and Lao alphabets, which developed from it. (...)
Tamil language is more than 5000 years old and its literature is vast and varied. Tamil is one of the longest surviving classical languages in the world. Tamil is the First classical language of India.
South Tukkestan Brahmi script: This folio of the popular Saddharmapuṇḍarīkasūtra (Lotus Sutra) is written in Sanskrit in an early form of South Turkestan Brahmi script. The manuscript originally comprised more than 350 folios, each consisting of two thin layers of paper pasted together. Leaves of this same manuscript are preserved in London, Munich and Berlin. Ink on paper. Public Domain