Section 20A. No interest in the real estate of a deceased person conveyed absolutely or in mortgage for value and in good faith by an instrument duly recorded shall be liable to be taken on execution, or sold under any judicial proceeding for payment of expenses or charges of administration, after the expiration of six years from the time of such executor or administrator giving bond for the performance of his trust, unless in pursuance of a license to sell real estate granted upon a petition filed in the registry of probate within said six years.