The inscription on this copper plate is in Old Malayalam written in Vatteluttu script with some Grantha characters. 

It's the famous Cochin Jewish plates from 1000 CE, granting privileges to Joseph Rabban.

English translation-

Svasti Sri!

This is the gift [prasada] that His Majesty [Tiruvati], King of Kings [Ko Konmai Kontan Ko], Sri Parkaran Iravivanmar, who is to wield sceptre for several thousand years, was pleased to make during the thirty sixth year opposite to the second year of his reign, on the day when he was pleased to reside at Muyirikkottu.

We have granted to Issuppu Irappan, the [guild of] ancuvannam, tolls by the boat and by other carts, ancuvannam dues, the right to employ the day lamp, decorative cloth, palanquin, umbrella, kettledrum, trumpet, gateway, arch, arched roof, weapon and rest of the seventy two privileges. We have remitted duty and weighing fee.

Moreover, according to this copper-plate grant given to him, he shall be exempted from payments made by other settlers in the town to the king [koyil], but he shall enjoy what they enjoy.
To Issuppu Irappan, proprietor of the ancuvannam, his male and female issues, nephews, and sons-in-law, ancuvannam shall belong by hereditary succession as long as the sun and moon endure—
Prosperity!

This is attested by Kovarttana Mattandan, the utaiyavar of Venatu.

This is attested by Kotai Cirikantan, the utaiyavar of Venpalinatu.
This is attested by Manavepala Manaviyan, the utaiyavar of Eralanatu.

This is attested by Irayaran Cattan, the utaiyavar of Valluvanatu.

This is attested by Kotai Iravi, the utaiyavar of Netumpuraiyurnatu.

This is attested by Murkkan Cattan, the Commander of the Eastern Forces.

This writing is executed by Vanralaceri Kantan-Kunrappolan, the Officer who Takes Down Oral Communication.

Copper Plate Inscription of Indian King Parakaran Welcoming Jewish Leader Joseph Rabban On His Arrival In India In 1000 CE.