The move announced by the Thai information minister could get offenders up to 15 years in prison.
The Daily Telegraph newspaper said King Bhumipol is considered to be strictly a ceremonial figure by the Thai government, which bristles at suggestions that the monarch is involved in political affairs.
Bhumipol's role in Thailand has been a center of controversy amid the long running political upheaval taking place in the country. Anti-government protesters have contended that they were acting to protect the monarchy.
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