2nd, legal issues of using proxies.
Of the previous mentioned proxies, many/most are used on a daily basis often without the users knowledge and are routine to the operation of the Internet and perfectly valid and legal.
The one that there may be issues with are the anonymous proxies. Under the
Computer-Related Crime Act the following are prohibited.
# illegally accessing a computer system and its data;
# disclosing to third parties knowledge and measures to circumvent access protection of a computer system and data;
# illegally intercepting electronic communications and data;
# illegally causing damage, changes or amendments of a third party’s computer data in whole or in part;
# illegally causing the work of a computer system to be suspended, delayed or disrupted; and
# illegally sending computer data or electronic mail disguising the source of such data in a manner that disturbs other persons’ operation of their computer systems.
All of the above acts, which are best known to computer-users by the terms 'hacking, spam and virus attacks' are subject to a fine or imprisonment or both. In the event that the aforesaid acts cause damage or delay to a computer system or illegally send computer data in a manner disturbing the operation of another computer and cause damage to the public, to national security or public security or public services then the penalty under the CCA is quite severe. A person committing any such offence could face imprisonment of up to fifteen years.
Some specifics of the law:
Article 8: Those who conduct whatever acts electronically to intercept data being transferred between others' computers, when such data is not for public use, are subject to three years jail and/or a Bt60,000 fine.
Article 9: Those who unlawfully damage, destroy, delete, alter, or modify, wholly or partly, information on other's computers: subject to three years jail and/or a Bt100,000 fine.
Article 11: Those who send data or electronic mails to others without revealing their identity, or by posing as someone else, in an act that disrupts the others' normal computer use: subject to a Bt100,000 fine.
A quote: The Information and Communications Technology (ICT) Minister has said in an interview in the Bangkok Post that he has not blocked these methods because "using proxies to access illegal sites are illegal, whereas using proxies to access legal sites is legal."
In other words, the use of anonymous proxies in itself is not illegal but how it is used such as to circumvent government blocks, to access Internet porn, gambling and other prohibited or illegal sites. This also relates to Thaivisa's rules on the subject.