Plesk allows for PHP source code encoding. This is useful, when you need to ensure one or all of the following:

• Protection for your extension’s licensing model from tampering,
• Protection for your intellectual property expressed in your extension’s business logic from illegal access.

When submitting your extension to Plesk for publishing, request that the Plesk team encode your extension. This will ensure that your extension’s source code is encoded and works correctly on all target Plesk product versions, free of charge.