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Contracts can almost always be enforced against a licensor. If a licensor promises you the source code or promises not to interfere with your lawful uses of the software, he is bound by those promises as long as you reasonably relied on those promises when you accepted the contract. The general rule is that the author of a contract is bound by his own words.
In most jurisdictions, contracts can be enforced against a licensee only if the licensee agreed to be bound to the contract.
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