[L]egislate a restriction on the use of credit default swaps (essentially insurance contracts against the failure of a company's bonds), requiring that such swaps may be used for bona-fide hedging purposes only. That is, a credit default swap could not be entered for purely speculative purposes, but only to offset the default risk of the same or similar bonds held by the investor.
This is similar to George Soros's recent comments on credit default swaps (e.g., in this Wall Street Journal op/ed last week, "One Way to Stop Bear Raids"), and it's consistent with the long-standing doctrine in the insurance business that only those with an "insurable interest" (i.e., something to lose if something bad happens to the insured) are allowed to take out insurance policies1. This reduces the chance that a policy holder will try to deliberately damage the insured in order to collect on the insurance policy.
Hussman covers a lot more ground in this week's commentary, and his essay is worth reading in full.
1In the early days of the insurance business, this doctrine wasn't in force, and it was possible to, for example, take out a life insurance policy on a complete stranger, despite the perverse incentives that would create.