Unless the school gives you permission it is an infringement. I doubt they would sue you, but can certainly force you to stop and cause a problem....

Can I be sued for trademark infringement ?

All you can do is have this properly analyzed. Before you respond in any way, I suggest that you consult with a lawyer in private and discuss...

Friend died and was given permission to use his likeness in a book. Can that permission be revoked later?

You really should not need any permission in this context. The use of your friend's name, image or likeness in connection with the sale or...

Can I use public domain pictures for my book?

If they are in the public domain, which is generally anything published prior to 1924, then they would be free to use. You just have to be sure...

Who owns the contents of the documents i sent? they contain confidential info and were sent to wrong person

Just because you sent something to the wrong person doesn't necessarily affect the ownership of that thing. If you know they are now in...

Is it legal to buy a childs toy that is completely unbranded and place your own (registered business) branding on it for resale?

In many cases, this will not be an issue. But to be sure you would have an agreement, often called a white label agreement, between you and the...

No, but if you are using the name in advertising and on business documents, etc. with no reference to the underlying limited liability entity then...

From an intellectual property perspective, this kind of solely personal use is not going to be an issue as the courts consider it de minimis. But...

Is this legal?

It's a copyright issue for you and a trademark issue for the shop. They are fine is they want to buy licensed decorations and display them within...

Likely this is not a problem unless you are actually infringing on the copyright of the character, which can be protected even apart from the works...