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1. Software whose copyright has expired or has been explicitly relinquished, allowing anyone to use it without restrictions.
2. A license that allows the buyer to use the software for commercial purposes, typically requiring a fee to be paid.
3. A type of proprietary software that is initially offered for free, allowing users to try it before purchasing.
4. Software that is released with its source code made available for modification or enhancement.
5. Software that is owned by an individual or a company and is not available for public use or modification.
6. A software license that grants users the right to use the software, without access to the source code.
7. The process of granting or obtaining permission to use certain intellectual property, usually through a legal agreement or contract.
8. Software that is available for use at no cost, but with some restrictions on its use or distribution.