No. You need to seek permission from the owner.
Yes
Marking property without the owners consent is considered defacement and vandalism and this is a punishable crime
If someones offers something without being asked they are a volunteer
yes without there consent. or if used for illegal purpose.
If you're going to do this, it needs to be a written and notarized contract signed by both of you and a witness. You can't do it without their consent, and you have no protection against them claiming theft without the signed and notarized contract.
it depends if your writing on someones property without them saying its ok.
Trespassing.
You can only encumber your own interest in the property. You cannot affect the co-tenant's interest in the property without their consent.
The property owner. A paleontologist can not walking onto privately owned property and start digging without the owners consent. And if they accidentally do and did discover something, the property owner still holds the rights to that discovery.
That would be considered theft or a robbery. Theft involves taking someone's property without their consent, while robbery involves taking someone's property by using force or threat of force.
Yes, because writing on someone's car that you don't even know who it belongs to is what the government calls "vandalism", or the destruction or alteration of one's property without consent.
undermining someones athority Also means entry to anothers property without right or permission