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The exclusive right granted to a patentee in most countries is the right to prevent others from commercially making, using, selling, importing, or distributing a patented invention without permission. (Wikipedia)

A defensive publication prevents others from later being able to patent the invention. (Wikipedia)

The European Central Bank sent the euro tumbling on world markets after it warned that the 18-member currency zone may need further support to prevent a Japanese-style period of stagnation. (The Guardian)

In many countries, however, a condition subsequent (common law) or a resolutory condition (civil law) would not prevent the option from vesting. That would be the case, for example, of a condition that is applicable after the option becomes exercisable and under which the option will be lost if employment is terminated before the option is exercised. When all conditions (such as that one) under which the option may be forfeited have disappeared, the option, which has already vested in the previous example, is said to have "irrevocable" vested. (Model Tax Convention on Income and on Capital 2010 By OECD)