Except that using encryption can directly affect the ability to execute the warrant, similarly to how you would use a shredder on physical documents. The files

Except that using encryption can directly affect the ability to execute the warrant, similarly to how you would use a shredder on physical documents. The files are in a state which is extremely difficult to work with, for the express purpose of preventing their access even with a warrant. Is that obstruction of justice? It would be with a shredder or a safe wired to burn papers if forced open.