The following can be grounds for opposition:

• proprietary rights
• trade names
• notorious or well-known mark
• the mark is descriptive
• the mark is not distinctive
• the mark is misleading, deceptive or disparaging
• registration in the name of the agent or other representative of the proprietor of the mark
• rights in a company name
• rights in a personal name
• unauthorized use of specially protected emblems or national insignia