A non-compete clause, or covenant not to compete (CNC), is a term used in contract law under which one party (usually an employee) agrees to not pursue a similar profession or trade in competition against another party (usually the employer). As contract provisions, a CNC is bound by traditional contract requirements, including the consideration doctrine. The use of such clauses is premised on the possibility that upon his or her termination or resignation, the employee might begin working for a competitor or starting a business, and gain competitive advantage by abusing intimate knowledge of the employer's operations to release trade secrets or sensitive information such as customer/client lists, business practices, upcoming products, and marketing plans.
Conversely, a business might abuse a non-compete covenant to prevent an employee from working elsewhere at all. Most jurisdictions in which such contracts have been examined by the courts have deemed them to be legally binding, so long as the clause contains reasonable limitations as to the geographical area and time period in which an employee of a company may not compete. Courts have held that, as a matter of public policy, an individual can not be barred from carrying out a trade in which he has been trained except to the extent that is necessary to protect the employer.
The majority of U.S. States recognize and enforce various forms of non-compete agreements. In converse, few States totally ban or prohibit non-competes to the extent, for example, that California does. For this reason, non-compete agreements have been popular among companies with employees not working in the States where non-competes are banned.
Let me know what state you're in and I'll try to find some specific information for you.
In general, your best chance is to allege that the time period is unreasonable. 10 years is very long. Most non-compete clauses are for 2-5 years.
The fact the document was not notarized unless you are willing to allege you didn't sign it or the signature was obtained by fraud.