Don't do that.
You can't retroactively rescind an agreement that you entered into, and for which you took the benefit (i.e., your employment).
Either the agreement is legal or it isn't. If the agreement protects trade secrets, confidential, or proprietary information, then it is legal and enforceable. If it protects information other than that, it is illegal and unenforceable. Your trying to get out of an agreement that you entered into has no effect at all on whether the agreement is legal or illegal.
Whether information constitutes a trade secret, confidential or proprietary information depends heavily on the facts. No one on Avvo can tell you, based on the limited information we can get here, whether the agreement is legal and enforceable or not. It would take an extended conversation, which you can't have and are well-advised not to have on a public website like Avvo.
I hope this information is helpful to you.
Craig T. Byrnes
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Assuming their Confidentiality Agreement is valid (consult with an attorney about that), you will likely open yourself up to a lawsuit. Rescission is basically not an option open to you at this point. Rescission generally requires restitution -- i.e., your return of the goods/materials you received via the contract. That is impossible at this point because you can't "unlearn" the info and, in fact, you want to take advantage of that info. If one could simply "rescind" these agreements as you've set forth, they'd be worthless.
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If you brought these clients with you, it is doubtful that they can prevent you from contacting your former clients. However, you really need to see an employment attorney to review the agreement with you. You cannot unilaterally rescind the agreement unless there is fraud or some other special circumstance. However, you might want to write a letter stating that your former clients are not covered by your agreement with them. Or you might not want to write them at all and just contact your former clients as you want to. Have an attorney look over your agreement and advise you what your options are.
Do not go about it that way. You will get sued.
It is critical that you do this the right way. Even if you do, a former employer will often use to cause you to incur crippling attorney fees at a time when you need cash flow to start your business.
Be smart and hire an attorney to walk you through this part. It is the prudent thing to do.
Good luck to you.
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I agree with the answers above that you should not do that and likely do not have grounds to rescind the Confidentiality Agreement.
Independent of the confidentiality agreement, the names, address, and contact persons of the customers of your former employer are likely their trade secret under Business and Professions Code section 16607. The law provides that you may contact the trade secret customers to make an announcement of your new employment, but nothing more, and that you may not solicit the trade secret customers' business.
I recommend you consult an attorney or consult your new employer's attorney before taking any action.