The most important property of software developers is their knowledge. The source code of Java programs can easily be recovered from a delivered jar file. This is fundamentally different from languages like C.
ClassGuard is a tool to prevent Java decompiling. Your Java class files are encrypted using AES encryption. The AES key is generated randomly every time you start the encryption tool. The decryption is done transparently by a custom class loader. The main part of this class loader is written in C to prevent decompiling and other tampering.
The current version additionally contains a license manager for Java applications. The main part of the license manager is also written in C. Java class files are only decrypted if a valid license is found.
New: ClassGuard for Android is now available!