It is. If any document dictates the terms for even resigning, that amount to the Bonded Labor. Given the situation that our legal system is lethargic and without any clear process defined for the notice period, employers use this as an advantage in asking for a longer notice period. An employee may win the case if he legally fights for the longer notice periods. It is the duration that the employer buys from the resigned employee to identify a suitable candidate in his position. The employer cannot claim any bond amount spent on training the employee . In developed nations like in USA, the notice period doesn't extend beyond 14 days. If an employer dictates terms to even resign (like you can resign after one month in India) and has got the signature from the employee for this, it surely amounts to the Bonded Labor.