Hopefully your "friend" will be able to recall, or they may know, who it was they sold your things to and you can request their return. If not, you are out of luck.
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 government may not enter, seize, or otherwise use an individual's personal property without probable cause or the owner's consent.
The government may not enter, seize, or otherwise use an individual's personal property without probable cause or the owner's consent.
No an attorney cannot hold personal property without reason or even with reason. There is no documented reason that any attorney should withhold personal property.
No an attorney cannot hold personal property without a court order. There is no documented reason that any attorney should withhold personal property.
International copywrite law prevents unauthorised transmission of any intellectual property without written consent - this consent is rarely provided without royalties being paid to the owner of the property.
No. You need to seek permission from the owner.
In most cases you are defiling the property of someone else without their consent.
Yes, but you cannot own property without emancipation.
In the US, at least, you can play "domination" games with the dominated person's consent. But you cannot abuse another person without their consent. You cannot take their money or property without their consent. You cannot prevent them from seeking employment or accepting payment for legal work without their consent.
The co-owner can only transfer their own interest in the property. If there are four owners the interest of one would be a one-quarter interest. A co-owner can transfer their own interest in the property without the consent of the others.