Just in time for Thanksgiving, Pure Storage has charged that storage rival EMC(s emc) stole one of its flash-storage arrays in an attempt to steal trade secrets, and EMC has responded with a patent infringement suit.

This is just the latest in a drama started last month when EMC sued a former salesman, charging that he took proprietary EMC information with him to Pure Storage. EMC subsequently sued Pure Storage itself alleging that it had hired dozens of former EMC employees who had “stolen tens of thousands of pages of proprietary, highly confidential and competitively sensitive EMC materials.”

On Tuesday, Pure Storage filed court documents alleging that EMC last year  “surreptitiously obtained a Pure Storage array, absconded with the device to EMC offices, and unlawfully tested the machine to learn the trade secrets underlying Pure Storage’s success.”

“EMC’s theft was not an isolated incident, but part of an institutional practice…