SGPC have a section about Sri Guru Granth Sahib. It says how the Guru Granth Sahib Came to be in the first section. It says the following
"...Guru Arjan got the original after binding. He installed the GUru Granth Sahib at Harmandir Sahib on 1604. Baba Buddha was appointed its first Granthi or keeper. This copy passed into custody of Bhai Dhirmal, son of Guru Hargobind, who refused to give it to the Guru..."
Who is Bhai Dhirmal? Is he revered in Sikhi? Why did he refuse to give a copy of Adi Granth to Guru Harogobind?