A specific security does not meet the requirements of secured securitization products as collateral, so it cannot be included in the pool of secured securities.

According to Baidu Library, the secured securities pool refers to a group of collateral (usually bonds or other assets) used to support securitization products. These collateral are put into a pool as collateral to support securitization products to provide additional security and credit guarantee. When the debtor fails to perform the debt, the collateral in the secured securities pool can be used to make up for the loss. However, if a security does not meet the requirements of the secured securities pool, it may be because its quality, liquidity, rating and other aspects do not meet the standards of collateral. Therefore, these securities cannot be included in the pool of secured securities, nor can they be used as collateral to support securitization products.

Securities are all kinds of economic rights and interests certificates, which are used to prove that the holders of securities enjoy certain rights and interests. Securities mainly include capital securities, currency securities and commodity securities. Capital securities include stocks, bonds and their derivatives such as fund securities and futures contracts.