a previous unwritten expectation of perpetuity

enti

Saudi Aramco, Saudi Arabia’s state-owned oil giant, was granted exclusive rights for 40 years to drill for the country’s oil, the Financial Times reported. This would replace a previous unwritten expectation of perpetuity. The company continues to insist it will sell a stake to the public when conditions are right, after reports of long delays or even cancellation.
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a previous unwritten expectation of perpetuity ：之前不成文的永久权的期待？预期？

expectation的中文释义
0 [; v1 U4 q3 B6 F/ ]1  what you think or hope will happen 期待, 期望
2  a feeling or belief about the way something should be or how someone should behave 预期
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trivialstuff

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: B- U6 \" X3 G: ~: E3 |3 t8 WSaudi Aramco之前的独家采油权1999年到期了，但之后它并未被明文规定不得继续采集，所以大家都预料（expect）这项特许权实际意义上是永久性（perpetuity）的了。但这下好了，规定出台了，它只能继续享受40年的特许权，即40年的特许权取代了之前被预料的不成文永久特许权。
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0 G1 A/ L) i9 y$ a( G, h参考：
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The previous concession ended in 1999, leaving a legal vacuum. Since then, “Aramco in effect holds an evergreen concession to exploit the reserves of the kingdom in return for a stream of income in the form of taxes, royalties and dividends,” according to a report by the Oxford Institute for Energy Studies.

) q5 ^6 W( X. L5 k1 Fhttps://www.bloomberg.com/news/articles/2018-08-27/saudi-arabia-is-said-to-grant-aramco-40-year-oil-concession
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Aramco has lost unlimited access to Saudi Arabia's oil reserves

https://www.businessinsider.com/saudi-aramco-loses-unlimited-access-to-oil-reserves-2018-8/

enti

原来是这样，感谢您的回复