Pandulipi means Manuscripts
They are books of old times written in Sanskrit with ink and feather of a peacock or something as a pen
Manuscripts in India are probably in Sanskrit. Manuscripts are available in other languages also including English.
In ancient Brahmin families the Subhashitas, which were like gems and helped the royal members to impress surrounding public were kept secret. Some of them do give such manuscripts for publication making it public. A Brahmin used to earn by sharing this knowledge.
Example of Subhashita - A wise should remain silent in a meeting of fools. When frogs start groaning the peacock should remain silent.
Such and other useful tips helped the new coming generation a lot in controlling self, controlling mind, body and senses and helped them become a complete man as their society and their families expected them to be.