Operators will log on to a website and reserve blocks of airspace for flights.
It's impossible to totally block a website: Twitter is blocked, but a lot of people here still use it in various ways".
Greatfire.org, a group that advocates for Chinese Internet freedom, claims it has made a number of blocked websites available this week including the BBC's Chinese service and Boxun, a Chinese-language media service known for provocative stories.
Motahhari kambasts the authorities for tarring those who speak out against injustices with the catch-all accusation of "threatening security" and criticises the blocking of a website set up by MPs that offered to help families of the missing.
The random allocation sequence was generated by the main researcher using a computer model (accessible through http://www.randomization.com website) with blocks of four and eight in order to allow having exact number of 68 in each group.
Tunisia blocks the website of a Lebanese newspaper for publishing unflattering US embassy cables about the regime.
This will make it so users will need to enter the password in order to add, edit or remove websites from the list of blocked websites.
A website discussing the legalisation of cannabis found itself blocked, as did several small wine dealers, said Pam Cowburn of the transparency campaign Open Rights Group.
Tunisia has blocked the website of a Lebanese newspaper that published US cables released by WikiLeaks describing high-level corruption, a sclerotic regime, and deep hatred of President Zine el Abidine Ben Ali's wife and her family.
Derek Slater, a Harvard student whose website was blocked because of such a letter, is delighted about the news: "I can hardly wait to get the retraction.
The government was quick to condemn the weekend-long rallies, calling them illegal and blocking the website of the organisers, a coalition of non-governmental organisations.
