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A taking on of the legal rights of someone whose debts or expenses have been paid. For example, subrogation occurs when an insurance company that has paid off its injured claimant takes the legal rights the claimant has against a third party that caused the injury, and sues that third party.

A debt that is not tied to any item of property. A creditor doesn't have the right to grab property to satisfy the debt if you default. The creditor's only remedy is to sue you and get a judgment. Compare secured debt.

The distinctive packaging or design of a product that promotes the product and distinguishes it from other products in the marketplace -- for example, the shape of Frangelico liqueur bottles. Trade dress can be protected under trademark law if a showing can be made that the average consumer would likely be confused as to product origin if another product were allowed to appear in similar dress.

A private, profit-making company that collects and sells information about a person's credit history. Typical clients include banks, mortgage lenders and credit card companies that use the information to screen applicants for loans and credit cards. There are three major credit bureaus, Equifax, Experian and Trans Union, and they are regulated by the federal Fair Credit Reporting Act.

A business owned and managed by one person (or for tax purposes, a husband and wife). For IRS purposes, a sole proprietor and her business are one tax entity, meaning that business profits are reported and taxed on the owner's personal tax return. Setting up a sole proprietorship is cheap and easy since no legal formation documents need be filed with any governmental agency (although tax registration and other permit and license requirements may still apply). Once you file a fictitious name statement (assuming you don't use your own name) and obtain any required basic tax permits and business licenses, you'll be in business. The main downside of a sole proprietorship is that its owner is personally liable for all business debts.

Unauthorized use of a protected trademark or service mark, or use of something very similar to a protected mark. The success of a lawsuit to stop the infringement turns on whether the defendant's use causes a likelihood of confusion in the average consumer. If a court determines that the average consumer would be confused, the owner of the original mark can prevent the other's use of the infringing mark and sometimes collect damages.