Below is a short round-up of the IP treaties administered by the World Intellectual Property Organization signed by Cambodia, and the date of entry into force or signature:

– Hague Agreement Concerning the International Registration of Industrial Designs – February 25, 2017
– Patent Cooperation Treaty – December 8, 2016
– Madrid Protocol Concerning the International Registration of Marks – June 5, 2015
– Marrakesh Treaty to Facilitate Access to Published Works for Persons Who Are Blind, Visually Impaired or Otherwise Print Disabled – signed June 28, 2013 but no accession instrument and therefore not in force
– Paris Convention for the Protection of Industrial Property – September 22, 1998
– WIPO Convention – July 25, 1995
– Rome Convention for the Protection of Performers, Producers of Phonograms and Broadcasting Organizations – signed October 26, 1961 but no accession instrument and therefore not in force

Cambodia has signed a number of other multilateral treaties that contain provisions related to intellectual property rights, a full list of which can be found of the WIPO site:
http://www.wipo.int/wipolex/en/profile.jsp?code=KH