 As like as 52(2) of the European Patent Convention (EPC), section 9 of the Thai Patent Act 1999 states that Thai patent law does not include software (or computer program) from patentability because the computer software is not considered as an “invention”, in which it is not the idea of the product itself.Hence, the software is considered as the manual or instruction that was controlled by users to perform the tasks.A software patents law in Thailand has been controversial debates among the economists and national developers’ overtime since there were two significant developments in the international patent law; (1) the European Union’s attempt to harmonize national patent laws by the Proposal for a Directive of the European Parliament and Council on the patentability of computer-implemented inventions, and (2) the US court decision to expand patent protection to business methods.