License4J System

Key Features

• License4J is a pure Java library for creating and validating licenses.
• The key concept is features of a license.
• You can easily add any feature to your license file, i.e.
• name of the product, version, expiry date, number of executable instances, customer\\'s name, company, IP address, etc.
• The feature\\'s value can be string or any serializable Java object.
• You can have unsigned features - features that are not used in the signature generation/verification and therefore can change their values leaving the license valid.
• Also the library provides methods for signing arbitrary content that should not be changed by the user.

Technical Specifications

• **Publisher:** Smardec.com
• **License:** Demo
• **Operating System:** Windows 7, Windows 8, Windows 10, Windows 11
• **Last Updated:** October 15, 2025
• **Category:** Programming / Java