Groups one and two are items that are listed further to the multilateral Wassenaar regime, which are dual-use goods. Goods that are of use for military purposes, but aren't necessarily only for military purposes. Group two are items specifically designed or modified for military use. Group three and four cover nuclear items. Group five are items listed unilaterally by Canada, like strategic items. It also includes other items further to trade agreements, like peanut butter. Group six is the missile technology control regime. Group seven is the Australia group, which is chemical and biological weapons.
On October 17th, 2017. See this statement in context.