# AI告诉加拿大企业，根据加拿大反垃圾邮件法（CASL），默示同意是无限期有效的

- **ID:** `legal/canada-anti-spam-casl-consent`
- **领域:** legal
- **类别:** legal_risk
- **错误码:** `CAN-CASL-CONS-006`
- **验证级别:** ai_generated
- **修复率:** 77%

## 根因

CASL（2010年，第23章）规定默示同意有效期为两年（第10条第9款），之后必须获得明示同意；来自现有商业关系或已发布电子邮件地址的默示同意自给予之日起两年后失效

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| CASL S.C. 2010, c. 23 | active | — | — |
| CRTC Compliance and Enforcement Bulletin CRTC 2012-548 | active | — | — |

## 解决方案

1. ```
   Implement a consent tracking system that logs the date and type of consent (implied vs. express). For implied consent, set a 2-year timer and send a re-consent request before expiry. For example, use a database field `consent_expiry_date` with a cron job to flag expiring consents.
   ```
2. ```
   Obtain express consent by sending a clear opt-in email with an unchecked checkbox and a link to your privacy policy. The CRTC recommends that consent be 'obtained through a clear, positive action' and that the purpose of the communication be stated explicitly.
   ```

## 无效尝试

- **** — Assuming that a 'business relationship' clause in terms of service constitutes express consent — CASL requires express consent to be obtained through a clear, affirmative action (e.g., checking an unchecked box), not buried in fine print (70% 失败率)
- **** — Using a pre-checked consent checkbox for email marketing — CASL prohibits pre-checked boxes (Section 10(5)); the user must actively check the box to give express consent (80% 失败率)