Final answer:
Two kinds of intellectual property protection that still apply to open-source software are copyright and trade secrets.
Step-by-step explanation:
Two kinds of intellectual property protection that still apply to open-source software are copyright and trade secrets.
Although open-source software is freely available and can be used, copied, and modified, it is still protected by copyright law. The copyright holder retains certain rights and can enforce licenses and restrictions on the use and redistribution of the software.
Additionally, trade secrets can be used to protect certain aspects of open-source software. For example, developers may keep certain algorithms or implementation details as trade secrets, preventing others from using or copying those specific aspects without permission.