The main one in Europe is the EU Trade Secrets Directive, but all countries, including UK, will have their own versions. It seems like a really complicated legal area.
So you'd better be careful eh! You sharing this info now, woul then be illegal, according to this logic! You are doing exactly the same as Spurs, utilising and openly discussing confidential information from a third party.
It might be a trade secret, or there may be a duty of confidence, but once passed onto Spurs, it is 'out there'. It is highly tenuous to pin on Spurs. Just as it would be trying to pin in on you if you'd shared thrid party information. Far more likely you could look at the employee - MGW - and a breach of confidential employment contracts. However, there are laws to give workers freedom as well.
In short, there isn't much for Forst to pursue. Just the PL rules (not national laws) on approaching a player before their club.
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For a Duty of Confidence claim, these criteria need to be met:
Key legal test (the “Coco test”)
For a breach of confidence claim, three things must be shown:
1. The information must have the
necessary quality of confidence (i.e. it must not be public or trivial).
2. It must have been
imparted in circumstances importing an obligation of confidence.
3. There must be
unauthorised use of that information to the detriment of the person who communicated
#3 isn't relavent. #1 I think agents and various people knew about the clause and this is sport, so a bit more trivial than Coco (who made a new type of engine which he showed someone in confidence, who then ripped it off). #2 It was likely imparted to Spurs so they could make a pubic bid. So the circumstances it was given to them was not in confidence.
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Trade secrets are normally passed on with a contract, not to share information. Not sure they apply either.