What are the potential legal considerations when developing Add-Ons for proprietary Shop software like Magento or xt:commerce?

When developing Add-Ons for proprietary Shop software like Magento or xt:commerce, it is important to consider the licensing agreements of the software. Make sure to comply with the terms and conditions set forth by the software provider to avoid any legal issues. Additionally, ensure that your Add-On does not infringe on any existing copyrights or trademarks.

// Example code snippet for checking licensing agreements in Magento Add-On development
if ($licenseAgreementAccepted) {
    // Proceed with Add-On development
} else {
    // Display error message or prompt user to accept licensing agreements
}