Leased line: A telecommunications line leased for exclusive use from a communication service provider, typically used to connect geographically distant offices. Offering consistent bandwidth and higher reliability than standard connections, leased lines are ideal for businesses requiring secure, dedicated, and uninterrupted communication channels.

Least privilege: A computer security concept in which a user or program is given the minimum levels of access necessary to complete its tasks. This means granting only the rights or permissions necessary to perform an assigned job function, and no more. This approach helps limit the potential damage that can result from errors, system faults, or unauthorized use of privileges, making it a fundamental strategy for maintaining system security.

Legacy System: A legacy system is an outdated computing system or application that is still in use despite being surpassed by newer technologies. These systems often lack support and modern security features, making them vulnerable to cyber threats. Security strategies for legacy systems may include isolated environments, stringent access controls, and regular risk assessments until they can be safely upgraded or replaced.

Legal holds in data retention: The process of preserving data that may be relevant to a legal matter. It is used by organizations to ensure that they do not destroy or alter any data that may be needed for a legal investigation or lawsuit. For example, a company may use legal holds in data retention to prevent the deletion of emails that may be relevant to a pending lawsuit.

Legal liability for data: The responsibility of an organization for the data it collects, stores, and uses. It is used to ensure that organizations are held accountable for their handling of personal and sensitive data. For example, a company may be held legally liable for a data breach if it fails to adequately protect the personal information of its customers.

Level of abstraction: The distance between the details of a system and the concepts used to represent it. Higher levels of abstraction use more general concepts and provide less detail, while lower levels provide more specific details. Examples of high-level abstraction might include using a database abstraction layer to hide the details of database queries or using a high-level programming language to represent complex algorithms.