Building materials company Keegan Quarries ploughed €3 million into leasing and developing a commercial property at Drogheda Port. But now the Meath-based firm claims its business is being significantly hampered by anti-competitive licensing restrictions that stop it from importing cheaper cement products. The firm, which is part of the wider Keegan group of companies, has brought a judicial review challenging permits issued by port operator Drogheda Port Company last June that limit the cargo it can handle to products used in its own manufacturing processes. Keegan Quarries says the licensing decision precludes it from handling import products, including construction powders,…