The obligations of the Stockholders under this Agreement are several and not joint. The Company acknowledges and agrees that by executing this Agreement the Stockholders are not waiving any claims they may have under, or releasing the Company from any obligations it may have under (i) that certain Securities Purchase Agreement dated as of March 9, 2015, or (ii) the Series B Exchange Agreement; provided , however , the Company and the Stockholders agree that Sections 4(b) through 4(f) of the Series B Exchange Agreement shall be of no further force or effect.