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Building on it: what may you do?

Short answers based on the licence, for the version in the catalog.

• B1 Change the code for internal use in your company Yes, with conditions Usually, for internal use. Check the terms.
• B2 Build your own product or service on top and offer it to customers as SaaS No Usually no for a service that competes with the vendor, without an agreement.
• B3 Make a closed-source derivative and sell or distribute it No No, not without an agreement with the vendor.
• B4 Use the project's name and trademark No No, not without permission. The licence covers the code, not the name or logo.

Keep in mind

• Open core: parts of the project (often an ee/ or enterprise folder) are under a separate commercial licence and may not be changed or used freely.
• There is a licence note for this product (e.g. parts under another licence or version-specific terms): read it and check the licence of the exact version you use.

This is guidance, not legal advice. Check with a lawyer before deciding.