If I buy sources, what am I (not) allowed to do with them

Generally, you must not disclose the sources you receive to any other 3rd party entity (person or company) without our written consent. This applies to all kind of source code you may receive from us (except publicly available examples).

On top of that, for activation server, following applies:

• If you order in-house license, you can use TLL Activation server sources only for your products
• If you order vendor license, you can use TLL Activation server sources to protect 3rd party products. However, you still must not disclose the sources.

Otherwise, you are free to build your protected apps!