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Target customers: users whose Elastic Compute Service (ECS) instances or servers deployed in data centers have system vulnerabilities and users who want to fix the vulnerabilities in a quick manner. Features released: If you did not purchase Security Center or purchased the Anti-virus or Value-added Plan edition of Security Center, you can separately purchase the quota for fixing system vulnerabilities without the need to purchase Security Center or upgrade the edition of Security Center. This feature is more flexible and can help you effectively reduce costs. If you use the Advanced, Enterprise, or Ultimate edition of Security Center, you do not need to separately purchase the vulnerability fixing feature.