Digital Watermarking is the process of inserting a digital signal of a defined pattern into digital data. This is used to identify the owner of the work, to authenticated the content, to trace illegal copies of the work and other similar purposes....

Information Technology [IT] revolution and spread of E-Commerce has radically revolutionized businesses and human lives. Internet is a worldwide technological phenomenon and has significantly influenced use of Internet & resultant experiences of Internet users....

In recent years many specialised works on specific topics in heterocyclic chemistry have appeared, while at the same time the more general text-books on organic chemistry have not given this important part of the subject the attention it deserves. In fact, the chemistry of heterocycles lies at the heart of drug discovery....