24601
My impression is that rights are similar to warrants, except they have a shorter life. Below are the "industry" definitions.
right
A privilege allowing existing shareholders to buy shares of an issue of common stock shortly before it is offered to the public, at a specified and usually discounted price, and usually in proportion to the number of shares already owned. also called subscription right.
warrant
A certificate, usually issued along with a bond or preferred stock, entitling the holder to buy a specific amount of securities at a specific price, usually above the current market price at the time of issuance, for an extended period, anywhere from a few years to forever. In the case that the price of the security rises to above that of the warrant's exercise price, then the investor can buy the security at the warrant's exercise price and resell it for a profit. Otherwise, the warrant will simply expire or remain unused. Warrants are listed on options exchanges and trade independently of the security with which it was issued. also called subscription warrant.