Under UK law, such a company would not have been able to make a donation to any British political party.
Under UK law it is not illegal to resell tickets for concerts.
Nick Lockett, a solicitor and net law expert from Stanhope and Hooper, said the ruling was not a landmark judgement, but was simply reminding net companies of their responsibilities under UK law.
"There have always been specific provisions under UK law, from long before the first day of the internet, that said if you are in possession of information that identifies a wrong-doer then you can be ordered to hand it over, " said Mr Lockett.
As the Home Office has made clear, in late 2004, the Serious Fraud Office received a request from the Milan Prosecutor for legal advice about the circumstances in which David Mills could be extradited under UK law, based upon possible charges against him.
BBC: NEWS | UK | UK Politics | In Full: Tony Blair's statement
Under current UK law, anti-doping officials have no right to enter an athlete's premises without permission.
The European badger (Meles meles) is a protected species under European and UK law, but ministers can sanction killing in certain circumstances, including to tackle disease.
BBC: UK public opposed to badger cull, opinion poll suggests
The only successful prosecution in the UK under the 1988 law occurred in 2005 when a former Afghan warlord, hiding in south London, was jailed for 20 years.
So technically under UN law the US and UK will be breaking it if they invade Iraq without UN consent.
An independent Scotland would be regarded as a completely separate state under international law, with the continuing UK retaining responsibility for all UK institutions, laws and treaties.
It has even been discouraged from capturing pirates, because they might demand asylum in Britain, a request with which the UK might have to comply under international human rights law.
It is being brought under the 1998 Human Rights Act, which incorporates into UK law the European Convention on Human Rights.
Restrictions on how many Bulgarian and Romanian nationals can work in the UK were introduced following their accession, but under European Law, the restrictions cannot continue beyond the end of 2013.
But Mrs May told the BBC's Andrew Marr show that was not possible under EU law, although she was hoping to limit the impact on the UK economy.
BBC: UK will not extend Romania and Bulgaria migration curbs
The lawfulness of the first bill passed by the assembly under its new law-making powers was challenged in the Supreme Court by the UK government.
The Daily Telegraph reported the changes may also be illegal under EU law because it could lead to discrimination between some EU citizens working in the UK, with some facing the cuts while others working in the same job do not.
Alexandria Carr, a former UK Treasury lawyer now at law firm Mayer Brown, said those 11 countries moving ahead under so-called "enhanced co-operation" are legally bound to respect the rights of member states that do not participate.
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