Introduction:
The concept of rights implied in the Indian Constitution is indeed an outcome of sustained Indian demands during the British rule in India. The struggle for freedom from British colonial rule played a significant role in shaping the understanding and importance of rights among the Indian population. The demands for rights and freedoms were raised by various sections of Indian society, which eventually found expression in the Constitution of India.

1. Emergence of Nationalist Movements:
During the British rule, nationalist movements like the Indian National Congress and other organizations emerged, advocating for political, social, and economic rights for the people of India. These movements aimed to challenge British colonialism and establish a democratic and independent India.

2. Demand for Civil Liberties:
The demand for civil liberties was an integral part of the Indian freedom struggle. Indians demanded the right to freedom of speech, expression, assembly, and association, which were curtailed under the British regime. These demands were made through various protests, movements, and agitations, emphasizing the need for these fundamental rights.

3. Movements for Political Rights:
The Indian National Congress, initially a political organization demanding representation in the British administration, later became a platform for demanding political rights. The demand for self-governance, legislative powers, and the right to elect representatives became central to the nationalist movements. The Montagu-Chelmsford Reforms and the Government of India Act, 1935, were outcomes of these demands.

4. Struggle for Social Justice:
The Indian freedom struggle also witnessed movements for social justice and equality. The demand for the abolition of untouchability, equal rights for women, and the upliftment of marginalized sections of society gained momentum during this period. Social reformers like Mahatma Gandhi, Dr. B.R. Ambedkar, and others played a crucial role in highlighting these issues and advocating for the rights of the oppressed.

5. Influence on Constitutional Framing:
The sustained demands for rights and freedoms during the British rule had a profound impact on the framing of the Indian Constitution. The Constitution of India, adopted in 1950, enshrined a comprehensive set of fundamental rights, including the right to equality, freedom of speech, right to religion, right to life and liberty, and many others. These rights were a direct reflection of the aspirations and demands of the Indian people.

Conclusion:
The concept of rights implied in the Indian Constitution is undoubtedly an outcome of sustained Indian demands during the British rule. The struggle for freedom from colonialism led to the emergence of nationalist movements, demands for civil liberties, political rights, and social justice. These demands eventually shaped the Constitution of India, which guarantees fundamental rights to its citizens. The Indian Constitution stands as a testament to the aspirations and struggles of the Indian people for a just and inclusive society.