What does a possessory lien mean for a printer, is it like a mechanic's lien?
We cannot give legal advice. The following is not a substitute for the advice of a local attorney. But we hope the information will be useful.
A possessory lien differs slightly from a mechanic's lien in that the "mechanic" (carpenter, or etc.) is is not necessarily in possession of the property for which he seeks payment (for example, carpentry work on a house). A possessory lien differs in that the person seeking payment (the printer, in your case) actually retains possession of the (printed) materials until payment is rendered for them.