These types of agreements have facilitated the sale and expansion of credit. From a legal point of view, these agreements allowed the lender or seller to have a “property interest” in the goods and, at the same time, to grant the borrower a “owned” interest. These property interests allowed the borrower to retain and use the property as long as the payments were not late. A hardware supplier never knows when a bankruptcy will hit a customer. If a bankruptcy occurs shortly after the sale, a purchase security interest for materials sold with a constant interest in the product may offer security to the hardware supplier for a recent sale. The equipment supplier will be a secured creditor, at least for recent sales, instead of joining fully unsecured creditors. Security agreements often contain agreements that include provisions for fund development, a repayment plan or insurance requirements. The borrower may also authorize the lender to keep the loan guarantees until repayment. Security agreements may also cover intangible assets such as patents or claims. Appropriate pawning rights are easily amorphous forms of security interests that result only from the application of the law in certain circumstances. From an academic point of view, it has been found that there does not seem to be a true unified principle behind the circumstances that cause them.
 Real estate that may be guaranteed under a security agreement includes inventory of products, equipment, equipment used by a company, real estate and real estate owned by the company. The borrower is responsible for maintaining security in good condition in the event of a default. The property classified as collateral should not be removed from the premises unless the property is required in the normal framework of operations. In English law and in most general jurisdictions arising from English law (the United States is the exception, as explained below), there are nine main types of proprietary security interests: large institutional lenders will often have lengthy security agreements. However, the lender and debtor often want to keep their agreement secret. The unilateral funding declaration meets the legal requirements for submission, while providing minimal information to the public.