Foreign investment in publishing of newspaper, journals and periodicals is subject to approval [assuming discriminatory as stipulated in specific legislation applying to foreign investors and without any mentioning of other standard approval process to which domestic investors may be suject to].
"Article 1: The following investment sectors shall be restricted on the basis of national security, social welfare, or economic needs as listed in the sensitive list for the opening of industries and for the granting of national treatment in the attached annex.
Annex 1 
[...] IV. Manufacturing Related Services: Publishing of newspaper, journals and periodicals: subject to discussion with Ministry of Information and Ministry of Culture and Fine Arts " (Sub-decree 80/ANK/BK on Measures Restricting Certain Investment Sectors, 27 August 1999, Art. 1 and Annex 1)
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"Article 18: The total number of all Khmer language newspapers owned/possessed by foreigners shall not exceed 20 percent of the total of all Khmer language newspapers that are actually being published in the Kingdom of Cambodia. Once the newspapers owned/possessed by foreigners have been authorized to publish, may not be closed because of the decreasing of total number of Khmer language newspapers."(Law on the Regime of the Press, of 18 July 1995, Art. 18)
Sub-decree 80/ANK/BK on Measures Restricting Certain Investment Sectors, 27 August 1999, Art. 1 and Annex 1.
Law on the Regime of the Press, 1995, Art. 18
[<a href="https://www.wto.org/english/thewto_e/acc_e/khm_e/wtacckhm3a3_leg_4.pdf">Sub-decree</a>],[<a href="https://www.google.fr/search?q=law+on+the+press+cambodia&oq=law+on+the+press+cambodia&aqs=chrome..69i57j0l5.5359j0j4&sourceid=chrome&ie=UTF-8">Law</a>]