A leave and license agreement is an instrument/agreement wherein the licensor allows the licensee to temporarily occupy and use one portion of immovable property for carrying on his business for residential purposes.
The licensor grants the leave and license to the licensee for a minimum period of 11 months and for this, the licensee shall pay to the licensor a fixed amount of license fee/rent money. This agreement has to be mandatorily registered before the sub registrar of assurances at the place of jurisdiction where the property is located.
You say that you are in possession since 1992, whether this was renewed every year or periodically, if not then you cannot claim any rights it at this stage.
A rental / lease agreement cause a transfer of interest from the owner to the tenant, or lessor to the lessee.
A 'Leave & License' ensures that there is no transfer of interest from the Licensor to the Licensee. It is License to occupy and use the premises in the mentioned duration on mutually agreed terms. If the Licensee continues to occupy the property upon the cessation of the License or upon the prescribed notice period, they will be considered as unlawful occupants and action initiated against them for immediate eviction.