Hi Jihad,
1: No, the keys do not give anyone the ability to penetrate the privacy of your company.
2: No, only the purchaser is the only one who can transfer ownership and I believe you can acquire the licenses from him as part of his entire company. Please contact our sales department at 1-866-698-2020 or sales@2020spaces.com for full details.
3: Yes and No, the buyer can stop participating in our Maintenance and Support program at which time the licenses will no longer be entitled to upgrades or technical support but the licenses will continue to function in the version that you currently have installed.
Hope that answers your questions.
Neil