Support within China for jailed dissident Liu Xiaobo has been gaining pace online. And in response, the Chinese communist regime has moved to stamp out the voices of dissent.

On the popular Chinese search engine and forum Baidu.com, a search for Liu Xiaobo’s name comes up with this:

“Sorry, in accordance with the relevant legal regulations and policies, this forum has been temporarily closed.”

But it’s not just Liu’s name that’s been censored. The term “11 Years”—the length of Liu’s prison sentence—also appears to be barred.

Also censored is the phrase “Sui Bo Zhu Liu”—a pun on a Chinese proverb that translates to “drifting with the tide.” The phrase—with two of its characters sounding the same as Liu’s name—is being used by netizens to commemorate him.

Users on social networking website Twitter are paying respect to Liu with a symbolic yellow ribbon. And a support group for Liu has attracted nearly 1,000 members on Facebook. These websites are banned in China, but users are able to access them with special proxy software.

Liu, who turned 54 on Monday, co-authored the widely spread petition “Charter 08” calling for democratic reform in China. He was sentenced to 11 years in prison on Christmas Day, after being charged with so-called “inciting subversion of state power.” The Chinese communist regime has been heavily criticized for the harsh sentence.