These Thai title documents are marked with a garuda or khrut. A garuda is a mythical bird-like creature used as the national symbol of Thailand. In many cases the color of the garuda can be used to determine what type of title document you are looking at.
Land parcels represented by these Thai title documents can be mortgaged, leased, and sold. Land owners can grant rights to third parties, such as the right of superficies (which allows someone else to build and own a building on the land for a period of time) or usufruct (which allows someone to work the land for a period of time).
Original copies of these documents are kept at the Land Department. The Land Department annotates these deeds by attaching transaction records pertaining to the parcel. This includes sales and mortgage records, and any rights the landowner grants to third parties, such as a long-term lease or the right of superficies.