Since this is going to be a secure Web site, we need session management to support expiration and acknowledgement of a terms and conditions document before access can be granted.

因为这应该是个安全的Web站点，我们需要进行会话管理来支持过期，以及在授予访问权之前对条款和条件文档进行确认。

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The document may but need not contain a corporate seal, attestation, acknowledgement or verification.

该文件可以但并非必须包含公司印章、鉴证、声明或者证明文字。

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Memo 2012-198 (2012), an S corporation failed to properly document a donated conservation easement because no contemporaneous acknowledgement was received by the donee indicating whether any value had been given to the donor in exchange for the contribution.

FORBES: It's Hard To Satisfy The Qualified Appraisal Requirement For A Charitable Contribution If You Appraise The Wrong Property