Legally and as per Industrial Disputes Act, an employer is suppose to give notice or pay notice pay in lieu of notice. But there is no law which says that an employee should give notice before leaving.
Here, for an employee it is more like a moral responsibility to inform his employer in advance of his leaving. Even if there is specific clause in the appointment order insisting an employee to give notice or pay in lieu before leaving, there takes place an arrangement whereby the same is waived. Of course, many employers do demand from the employee the so called notice pay by threatening the employee that no relieving order will be issued, no PF form will be forwarded and like. Certainly, issuance of service certificate and relieving order is employer's right but in no way the employer can hold PF forms submitted by the employee.
I am sure that in India, no employer has ever taken any legal step against employee to recover notice pay.
Regards,
Madhu.T.K